3M mini mandrel 935 2-7/8in x 1/4in 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. Applications are power tools, accessories, compounds, specialties. Industries include aerospace, aoem, composite, cutting tool manufacturing, general industrial, marine, metalworking, mro, paint preparation, primary metal, transportation & heavy equipment, woodworking.