Standard Abrasives mandrel is a tool attachment designed to hold a Standard Abrasives unitized wheel. The 6 mm shank diameter fits a 6 mm power tool collet or drill chuck. An integral part of the overall application, the mandrel acts as a conduit, connecting the abrasive wheel with the rotary tool. 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 1 in Dia x 1 in W x 3/16 in CH unitized wheels. 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. Our Standard Abrasives mandrel is a helpful accessory for tackling hard to reach areas and getting inside those tight spots that your projects may require.