Hougen® Standard Rotabroach® 12,000 Series Magnetic Drill Annular Cutters are for use with Hougen® Portable Magnetic Drills and many competitive models on materials up to 275 BHN. they are made of hardened high speed tool steel and are precision ground for excellent performance throughout the cut and long tool life. They require less horsepower and thrust to cut, and last much longer than traditional holemaking methods. Rotabroach® cutters feature a 3/4" diameter double-flatted shank and are available in 1, 2, and 3" D.O.C. (depth of cut). For extended tool life and lower cost per hole, Rotabroach® Cutters are resharpenable.