Hougen 11088 RotaCut Arbor Triple Flatted for 38/-Inch Chucks features a pilot pin for use with 1/4-inch thru 3/4-inch diameter cutters. This arbor has a 3/8-24 mounting thread, and is triple flatted for a 3/8-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.