5/16"-18 UNC X 1-1/2" OD Carbon Round Die - High Performance & Durable Cutting Tool | Drill America Welding Tools & Clamps They are surface treated with

They are surface treated with abrasion-resistant black oxide and made of high speed steel with a 135° split point tip for fast penetration and accurate drilling

Choose the Drill America - 1-1/16 4MT HSS Oversized Shank Taper Shank Drill Bit for unmatched reliability and performance

Flute Length: 3-7/16"

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5/16"-18 UNC X 1-1/2" OD Carbon Round Die - High Performance & Durable Cutting Tool | Drill America Welding Tools & Clamps They are surface treated withCarbon round dies are for use in re threading existing threads. They are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Round dies are chamfered on both faces, one side has a 2 to 3 thread chamfer for threading and the other side has a 1 to 1 1 2 thread chamfer for threading close to a shoulder. Adjustments are made by a fine pitch screw which forces the sides of the die apart, or