Vitrified Mounted Point, Abrasive Material Aluminum Oxide, Bond Type Vitrified, Overall Dia. 11/16 in, Overall Thickness 1 1/4 in, Shank Dia. 1/4 in, Grit 36, Shape A12, Operating Speed - Maximum 48,000 RPM, Grade Extra Coarse, Compatible Tool Type Die Grinder, Straight Grinder