18;000 Series 2 Depth of Cut Carbide Copperhead Annular Cutter Copperhead Carbide Tip Cutters feature a durable grade carbide insert for extended tool life when used with Hougen Mag Drills on abrasive and tough-to-cut materials. Up to three times the cutting speed of twist drills and traditional tooling like twist drills; along with a longer tool life; a more accurate hole; and a better; burr-free finish For use with Hougen Portable Magnetic Drills that require 3/4" Weldon shank Two flats for cutter mounting make for a rigid connection to you mag drill and offers twice to tool life when compared to quick change or one touch tool mounting systems