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Best Choice HARFINGTON 
HARFINGTON Hex Threading Die M6 x 1 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tappin Size - Metric thread size: M6 x 1; cutting direction: right hand; outside diameter: 14.8mm / 0.58"; thickness: 6.35mm /sourcing map 
sourcing map Hex Threading Die M13 x 1.25 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M13 x 1.25; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 12HARFINGTON 
HARFINGTON Hex Threading Die M6 x 0.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tapp Size - Metric thread size: M6 x 0.5; cutting direction: right hand; outside diameter: 15mm / 0.59"; thickness: 6mm / 0.2HARFINGTON 
HARFINGTON Hex Threading Die M9 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M9 x 0.75; cutting direction: right hand; outside diameter: 20mm / 0.79"; thickness: 10mm / 0Best Value sourcing map 
sourcing map Hex Threading Die M12 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M12 x 1.5; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13mHARFINGTON 
HARFINGTON Hex Threading Die M4 x 0.7 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tapp Size - Metric thread size: M4 x 0.7; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmYamesh 
Yamesh M30 x 1.5 Hex Die Rethreading Die Thread Die Carton Steel For Right Hand 【Heat-Treated Carbon Steel】: Durable and strong for extended tool life.Generic XYWHPGV M3 Carbon Steel Hex Threading Die Machine Thread Die Hexagon Taper Pipe(a8a51 d0880 c3a28 16d4a 77b3a bcdb9 Threading dies are used to form or cut a male thread on the outside of rods or bars. Threading dies provide precision inuxcell uxcell Hex Rethreading Die M12 x 1.75 Pitch Carbon Steel Metric Hexagon Taper Pipe Die Accuracy Grade: 6g Made of heat treated carbon steel, high strength and hardnessYamesh Yamesh M22 x 1.5 Hex Die Rethreading Die Thread Die Carton Steel For Right Hand 【Heat-Treated Carbon Steel】: Durable and strong for extended tool life.sourcing map sourcing map Hex Threading Die M10 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M10 x 0.75; cutting direction: right hand; hex size across sides: 20mm / 0.79"; thickness: 10Yamesh Npt Pipe Die Hex Die Carbon Steel Rethreading Die 1/2-14 Made of Carbon Steelsourcing map sourcing map Hex Threading Die M9 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M9 x 0.75; cutting direction: right hand; hex size across sides: 20mm / 0.79"; thickness: 10mRennie Tool Company M8 x 1.25 HSS Hexagon Die Nut Metric Course. Threading/Hex Shank Hexagonal (M8 x 1.25 (8mm)) Manufactured From HSS M2sourcing map sourcing map Hex Threading Die M14 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M14 x 1.5; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13mCentury Drill & Tool Century Drill & Tool 98513 Solid Die Stock, 1-7/16" Hex Dies Secure Hex Die Compatibility: Designed to hold standard hex dies, this die stock ensures a reliable grip for threading tHARFINGTON HARFINGTON Hex Threading Die M14 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M14 x 1.5; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13msourcing map sourcing map Hex Threading Die M12 x 1.25 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M12 x 1.25; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13sourcing map sourcing map Hex Threading Die M16 x 2 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M16 x 2; cutting direction: right hand; hex size across sides: 32mm / 1.26"; thickness: 16mmKaimex 5/8"-11 Hex Die Rethreading Die Thread Die Carton Steel Right Hand Right HandQWORK QWORK Metric Hex Die Rethreading Die, M14 X 1.5mm Carbon Steel Machine Thread Die, for Mold Machining, Steel, Cast Iron, Durable: Made of premium carbon steel, overall quenching, good hardness, long term serivce.HARFINGTON HARFINGTON Hex Threading Die M6 x 1.25 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M6 x 1.25; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmUtoolmart Utoolmart Hex Rethreading Die, M10 x 1.5 Pitch, Carbon Steel Thread Die, Hex Rethreading Die Machine Thread Die, Hexagon 【Features】- Thread Type: M10 x 1.5; Made of heat treated carbon steel, high strength and hardness.HARFINGTON HARFINGTON Hex Threading Die M2 x 0.4 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tapp Size - Metric thread size: M2 x 0.4; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmHARFINGTON HARFINGTON Hex Threading Die M12 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M12 x 1.5; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13msourcing map sourcing map Hex Threading Die M6 x 1.25 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M6 x 1.25; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmsourcing map sourcing map Hex Threading Die M11 x 1 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M11 x 1; cutting direction: right hand; outside diameter: 20mm / 0.79"; thickness: 10mm / 0.3sourcing map sourcing map Hex Threading Die M16 x 1.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M16 x 1.75; cutting direction: right hand; hex size across sides: 32mm / 1.26"; thickness: 16HARFINGTON HARFINGTON Hex Threading Die M7 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M7 x 0.75; cutting direction: right hand; hex size across sides: 17mm / 0.67"; thickness: 8mmsourcing map sourcing map Hex Threading Die M1.6 x 0.35 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M1.6 x 0.35; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6sourcing map sourcing map Hex Threading Die M7 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M7 x 0.75; cutting direction: right hand; hex size across sides: 17mm / 0.67"; thickness: 8mmsourcing map sourcing map Hex Threading Die M6 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M6 x 0.75; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmYamesh Yamesh 5/8"-11 Thread Tap and Die Set HSS Tap with GCr15 Alloy Steel Hex Die Right Hand Thread Repair Tool for Metalwork Precision Inch Thread Cutting – Designed for inch-based threading, this set includes a 5/8"-11 high-speed steel tap andHARFINGTON HARFINGTON Hex Threading Die M11 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M11 x 1.5; cutting direction: right hand; hex size across sides: 22mm / 0.87"; thickness: 11mHARFINGTON HARFINGTON Hex Threading Die M11 x 1 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tappi Size - Metric thread size: M11 x 1; cutting direction: right hand; outside diameter: 20mm / 0.79"; thickness: 10mm / 0.3HARFINGTON HARFINGTON Hex Threading Die M13 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M13 x 1.5; cutting direction: right hand; outside diameter: 27mm / 1.06"; thickness: 13mm / 0sourcing map sourcing map Hex Threading Die M14 x 0.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M14 x 0.5; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13m10% Off Irwin IRWIN Tools Metric Tap and Hex Die Set, 41-Piece (26317) 41-Piece set in plastic caseHARFINGTON HARFINGTON Hex Threading Die M12 x 1.25 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M12 x 1.25; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13Century Drill & Tool Century Drill & Tool 97616 Metric Hex Die, 11.0X1.50 High Carbon Steel metric hex die.sourcing map sourcing map Hex Threading Die M16 x 1 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M16 x 1; cutting direction: right hand; hex size across sides: 32mm / 1.26"; thickness: 16mmCentury Drill & Tool Century Drill & Tool 97616 Metric Hex Die, 11.0X1.50 High Carbon Steel metric hex die.sourcing map sourcing map Hex Threading Die M3.5 x 0.6 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M3.5 x 0.6; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6msourcing map sourcing map Hex Threading Die M11 x 1.25 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M11 x 1.25; cutting direction: right hand; hex size across sides: 22mm / 0.87"; thickness: 11HARFINGTON HARFINGTON Hex Threading Die M5 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M5 x 0.75; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmsourcing map sourcing map Hex Threading Die M4 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M4 x 0.75; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmsourcing map sourcing map Hex Threading Die M4 x 0.7 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M4 x 0.7; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmHARFINGTON HARFINGTON Hex Threading Die M4 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M4 x 0.75; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmHARFINGTON HARFINGTON Hex Threading Die M3 x 0.6 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tapp Size - Metric thread size: M3 x 0.6; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmHARFINGTON HARFINGTON Hex Threading Die M4 x 0.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tapp Size - Metric thread size: M4 x 0.5; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmCentury Drill & Tool Century Drill & Tool, 98213, 5/8-11 NC, Hex Die, Precision Cut External Threads, High Carbon Alloy Steel Precision-Cut External Threads: These dies feature precision-cut external threads, ensuring consistent and exact threadiHARFINGTON HARFINGTON Hex Threading Die M3.5 x 0.6 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M3.5 x 0.6; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6msourcing map sourcing map Hex Threading Die M3 x 0.6 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M3 x 0.6; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmHARFINGTON HARFINGTON Hex Threading Die M6 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M6 x 0.75; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmNeiko NEIKO 00924A Tap and Die Set, 76 Piece, Metric and Standard, Rethreading, Cutting, Repairing Threading Tool for External BOLT THREADING KIT: Perfect kit to create new threads, chase existing threads, or repair damaged threads on most metalsHARFINGTON HARFINGTON Hex Rethreading Die M12 x 1.75 Metric High-speed Steel Right Hand Hexagon Screw Thread Cutting Threading Dies Size - Metric thread size: M12 x 1.75; Outer diameter: 27mm / 1.06"; Thickness: 12.7mm / 0.5"; Exhaust grooves: 5-hole.HARFINGTON HARFINGTON Hex Threading Die M16 x 1.25 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M16 x 1.25; cutting direction: right hand; hex size across sides: 32mm / 1.26"; thickness: 16sourcing map sourcing map Hex Threading Die M11 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M11 x 1.5; cutting direction: right hand; hex size across sides: 22mm / 0.87"; thickness: 11mHARFINGTON HARFINGTON Hex Threading Die M13 x 0.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M13 x 0.5; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13mHARFINGTON HARFINGTON Hex Threading Die M12 x 0.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M12 x 0.75; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13HARFINGTON HARFINGTON Hex Threading Die M15 x 1.75 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M15 x 1.75; cutting direction: right hand; hex size across sides: 32mm / 1.26"; thickness: 16HARFINGTON HARFINGTON Hex Threading Die M15 x 1 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tappi Size - Metric thread size: M15 x 1; cutting direction: right hand; hex size across sides: 32mm / 1.26"; thickness: 16mmHARFINGTON HARFINGTON Hex Threading Die M1.8 x 0.35 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M1.8 x 0.35; cutting direction: right hand; outside diameter: 15mm / 0.59"; thickness: 6mm /sourcing map sourcing map Hex Threading Die M1.8 x 0.35 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Size - Metric thread size: M1.8 x 0.35; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6HARFINGTON HARFINGTON Hex Threading Die M15 x 1.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tap Size - Metric thread size: M15 x 1.5; cutting direction: right hand; hex size across sides: 32mm / 1.26"; thickness: 16msourcing map sourcing map Hex Threading Die M13 x 0.5 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting T Size - Metric thread size: M13 x 0.5; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13mCentury Drill & Tool Century Drill & Tool, 98213, 5/8-11 NC, Hex Die, Precision Cut External Threads, High Carbon Alloy Steel Precision-Cut External Threads: These dies feature precision-cut external threads, ensuring consistent and exact threadiHARFINGTON HARFINGTON Hex Threading Die M14 x 1 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Tappi Size - Metric thread size: M14 x 1; cutting direction: right hand; hex size across sides: 27mm / 1.06"; thickness: 13mmHARFINGTON HARFINGTON Hex Rethreading Die M12 x 1.75 Metric High-speed Steel Right Hand Hexagon Screw Thread Cutting Threading Dies Size - Metric thread size: M12 x 1.75; Outer diameter: 27mm / 1.06"; Thickness: 12.7mm / 0.5"; Exhaust grooves: 5-hole.sourcing map sourcing map Hex Rethreading Die M12 x 1.75 Metric High-Speed Steel Right Hand Hexagon Screw Thread Cutting Threading Di Size - Metric thread size: M12 x 1.75; Outer diameter: 27mm / 1.06"; Thickness: 12.7mm / 0.5"; Exhaust grooves: 5-hole.CoCud CoCud Hex Rethreading Die, M3 x 0.5 Pitch, Carbon Steel Cylindrical Pipe Threading Tool with 3 Chip Holes - (Application ★ Hex Rethreading Die Size --- Thread Size: M3 x 0.5; Width Across Flats: 15mm / 0.59"; Thickness: 6.3mm / 0.25", Chip PFukaisu Fukaisu 2pcs PVC Pipe Threading Tool Kit, Integrated Internal & External Pipe Thread Cutting Tool with 1/2'' & 3/4'' Die Package Includes: You will receive 2 integrated internal & external pipe threading tools, 2 hex connecting rods, and 2 rsourcing map sourcing map Hex Threading Die M2 x 0.4 Metric Thread Right Hand High Speed Steel Rethreading Fixed Die Screw Cutting Ta Size - Metric thread size: M2 x 0.4; cutting direction: right hand; hex size across sides: 15mm / 0.59"; thickness: 6mmIrwin CHANNELLOCK 9727ZR Hex Die 9727ZR - die 6-1.0mm 1" Hexsourcing map sourcing map Hex Rethreading Die M5 x 0.5 Metric High-Speed Steel Right Hand Hexagon Screw Thread Cutting Threading Dies Size - Metric thread size: M5 x 0.5; Outer diameter: 15mm / 0.59"; Thickness: 6.4mm / 0.25"; Exhaust grooves: 3-hole. Sicizihuu Tap Die Socket Adapter 1/4" Hex Shank Metric Screw Tap Threading Tool,6PCS (M4-M12) Application:The screw tap tapping chuck are suitable for machine taps,use for wind batches,electric batches,electric driIrwin Irwin Industrial Tools 26313 Metric Tap and Hex Die Set, 24-Piece Designed For Use With Taps, ReamersHighfire HIGHFIRE 86 pcs Tap and Die Set, SAE and Metric Standard, Large Tap and Die Set with Hex Shape, Titanium Coated Tap and 86 PCS TAP & DIE SET SIZES - Includes 39 taps (metric and SAE), 39 dies (in metric & SAE), adjustable tap wrench, adjustIrwin Irwin Tools 9434 Round Fractional Hex Die Made of shock-resistant and heat treated S2 steel for maximum strength and hardnessIrwin 9738 10mm x 1.00 Hex Die, Made of shock-resistant and heat treated S2 steel for maximum strength and hardnessAlfa Tools Alfa Tools MHD70775 20Mmx1-50 Rethreading Hex Die Carbon Steel Rethreading hexagon Die metricDrill America Drill America m14 X 1.5 Carbon Steel Hex Rethreading Die, DWT Series Hex DieYakamoz Yakamoz 8PCS Tap Socket Wrench Set, 1/4" Hex Shank Square Machine Tap Socket Adapter M4-M16 Screw Sleeve Air Screwdriver 1. High Quality: The Tap Socket Wrench made of premium alloy steel with a corrosion-resistant black phosphate finish thaZyjGaliliad Round Die Chuck High Accuracy Carbon Steel Threading Die Collet, GT24 M22 M24 Compatible, 30mm Outer Diameter with Hex W High Accuracy Threading: This Round Die Chuck delivers precise male thread cutting up to 72mm depth, ensuring consistentIrwin Irwin Tools 7407 Irwin 1"- 11-1/2 Npt Re-Thread Hex Die Made of shock-resistant and heat treated S2 steel for maximum strength and hardnessuxcell uxcell Round Threading Dies, Metric M2.5 x 0.45 Thread (Right Hand), High Speed Steel (HSS) Screw Cutting Die Repair Too Round Threading Die: Thread size: M2.5 x 0.45 (right hand); outside diameter: 16mm / 0.63"; thickness: 5mm / 0.2"; accurAIMALL AIMALL 3PCS Adjustable Tap Socket Set for #6-1/2in Taps M3-M12, CR-MO Steel Tap Holder Sockets with 3/8in Square Drive H 🔧 Wide Tap Range Coverage: Adjustable tap socket set fits #6–1/2in taps and M3–M12, making it a versatile threading tooIRWIN Irwin Tools 7763 Irwin Re-Threading Hex Die-7/8"-14 Nf, HCS Left Hand Die-Bulk Made of shock-resistant and heat treated S2 steel for maximum strength and hardnessCLEVELAND Cleveland Hex Threading Die,1-1/8"-12,HSS C65627 Carbon steel substrateCLEVELAND Cleveland Hex Threading Die,M5x0.80,HSS C65580 Carbon steel substrateCLEVELAND Cleveland Hex Threading Die,9/16"-12,HSS C65612 Carbon steel substrateCLEVELAND Cleveland Hex Threading Die,7/8"-14,HSS C65621 Carbon steel substrateCLEVELAND Cleveland Hex Threading Die,1/4"-28,HSS C65602 Carbon steel substrateMilwaukee Milwaukee Electric - HEX-LOK 2-in-1 TAP and DIE Threading Handle 2-in-1 Functionality: Compatible with both 1" hex dies and the Milwaukee Tap Collet for threading versatilityVEVOR VEVOR Tap and Die Set, 110-Piece Include Metric Size M2 to M18, Bearing Steel Taps and Dies, Essential Threading Tool fo Unbeatable Durability: Our tap and die set is crafted from high-grade HRC55-62 hardened bearing steel, effortlessly handAlfa Tools Alfa Tools CSRTD70736 2 1/2-4 Rethreading Hex Die Carbon Steel Rethreading hexagon DieAlfa Tools Alfa Tools CSRTD70770 4" - 8" Carbon Steel Rethreading Hex Die Hexagon Die eight pitchAlfa Tools Alfa Tools HSHD74559 2-11-1/2 HSS Npt Hex Die Hexagon Die national pipe thread