3M Mini Mandrel is a tool attachment that holds a 1 inch wide strip of Scotch-Brite non-woven material, enabling the user to clean, polish, or deburr the inside diameter of a pipe or other cylinder. The 2-7/8 inch long mini mandrel fits onto a rotary tool like a die grinder or drill. The shank of the mandrel is 1/4 inch diameter and compatible with a 1/4 inch power tool collet or drill chuck.