Firepower Steel 0.25-in-Grit Grinding Wheel1 4 In. shank, 0. 014 In. wire size, 4500 max RPM Excellent for debarring, blending and cleaning of surfaces Small diameter brush is especially designed for use on portable air and electric tools End brushes are great for cylinder heads, pistons and valve ports, rubber and plastic flash removal, removal of rust, paint scale, tool polishing, and weld cleaning Features Sub Brand N A Series Name N A Application Grinding Material Steel Type N A Wheel Type