Vitrified Mounted Point, Abrasive Material Aluminum Oxide, Bond Type Vitrified, Overall Dia. 1/4 in, Overall Thickness 3/8 in, Shank Dia. 1/8 in, Grit 60, Shape W162, Shank Length 1 1/2 in, Specification 38A60-P, Operating Speed - Maximum 64,800 RPM, Series Gemini, Grade Medium, Compatible Tool Type Die Grinder, Straight Grinder