3/16" Hexagonal Rotary Punch Broach, 8Mm Shank, M2 High Speed Steel, Bright Finish Pilot Precision Products - Hassay Savage Hexagonal Rotary Punch Broaches. Use With Rotary Punch Broach Holders In Any Type Of Cnc Or Manual Turning, Milling, Drilling Or Screw Machines. Many Applications Can Be Achieved Without The Use Of The Rotary Broach Holder. For Merely Punching A Polygon Into An Existing Pilot Hole, These Broaches Have Been Used Successfully With Universal Machining Methods. Use M2 High Speed Steel Rotary Punch Broaches For Mild Steels And Softer Materials. Use M42 Hss Cobalt 8% Rotary Punch Broaches For More Difficult To Machine Materials Like High Alloy Steels, Ductile Cast Iron, Tool Steels, Stainless Steels And Titanium Or Nickel Based Alloys. Hassay Savage Part #66012