Hougen 12120 5/8-Inch Diameter Rotabroach 1-Inch D.O.C. is an accessory for the "12,000 Series" Cutters, to be used on Hougen Portable Magnetic Drills and materials up to 275 BHN. This M2 H.S.S. Cutter features a 3/4-inch diameter shank, and is made of hardened, high speed tool steel and precision ground. The 5/8-inch cutter diameter is to be used with pilot 10533, and has a decimal equivalent of .6250.