The Standard Abrasives unitized mandrel secures a 2 to 3 in Standard Abrasives unitized wheel to a rotary tool for edge deburring and finishing applications. The silver button fits wheels with thicknesses of 1/8 in or 1/4 in and the black button accommodates wheels with thicknesses of 3/8 in and 1/2 in Use this mandrel with a Standard Abrasives 913 or 933 unitized wheel (sold separately). The Standard Abrasives unitized mandrel is a tool attachment designed to hold a small Standard Abrasives unitized wheel. The 1/4 in shank diameter fits a 1/4 in power tool collet or drill chuck. An integral part of the overall application, the mandrel helps operators effectively deburr and finish intricate or hard to reach areas. Easy attachment some Standard Abrasives unitized wheels come with quick-change attachment styles - TS, TR and TP. This mandrel was especially designed for center hole (CH) unitized wheels without quick-change attachments. The mandrel facilitates easy fastening of the abrasive wheel to the tool. It drives CH wheels with 2 to 3 in Dia and a 3/8 in center hole. Made with steel, it is exceptionally durable and long lasting, so it can stand up to repeated wear and be used during heavy duty applications. The Standard Abrasives mandrel is a helpful accessory for tackling hard to reach areas and getting inside tight spots on the workpiece.