The 3M™ mini mandrel is designed to work with your die grinder or rotary tool. This accessory grips a 1 in W strip of Scotch-Brite™ non-woven material allowing you to access tight internal diameters, typically for surface conditioning or polishing tasks. The 3M™ mini mandrel is an accessory that attaches to your die grinder or drill. It holds a 1 in W strip of Scotch-Brite™ non-woven material. Secure its shaft into the collet assembly of your drill chuck or rotary power tool-to clean, polish or deburr the inside diameter of the workpiece. The 2-7/8 in L mini mandrel is useful in metal fabrication, woodworking and millwork, in the manufacture of medical instruments, turbine engine manufacture, plumbing and other industries where finishing internal diameters is necessary.