Hougen 11005 RotaCut Arbor for 1/2-Inch Chucks features a pilot pin for use with 13/16-inch thru 1-1/2-inch diameter cutters. This arbor has a 1/2-20 mounting thread, and is triple flatted for a 1/2-inch chuck. Hougen maintains a complete stock of replacement parts for all sheet metal arbors. RotaCut cutters are precision-ground and produce clean, burr-free, round holes without deforming the surrounding material.