Built from M42 high-speed steel, this Hougen annular cutter is designed for fast hole-cutting in a wide range of metals. Its stack-cut geometry allows it to cut through two or more pieces of steel at once, which can save time when working with layered stock. The tool-less shank makes it quick to switch between the 1-inch and 3/4-inch sizes, and the cutter is intended for use with the Hougen HMD130 or HMD115 magnetic drills. Pilots 17810 (for the HMD130) or 17100 (for the HMD123) are required for operation.