Mounted Point, Abrasive Material Aluminum Oxide, Bond Type Resin, Overall Dia. 1/4 in, Overall Thickness 1/2 in, Shank Dia. 1/8 in, Grit 80, Shape W163, Primary Material Application Carbon Steel, Shank Length 1 1/2 in, Specification A80-HBF3, Operating Speed - Maximum 59,990 RPM, Series A, Grade Medium, Compatible Tool Type Die Grinder, Flexible Shaft Grinder, Straight Grinder, Pencil Grinder, Drills