1/2 X 1 RotaLoc Plus™ Annular Cutter. For use with HMD130 or HMD150 magnetic drill. M42 High Speed Steel. Contains stack-cut tooth geometry for cutting thru one or more plates at one time. 1 D.O.C. Annular cutters for use with the Hougen HMD130 magnetic drill. Made from M42 HSS for fast holes in all types of metals. Features a tool-less shank for quick size changes. Made with stack-cut geometry for cutting thru two or more pieces of steel at one time. Requires pilot 17810. Made in USA.