Vitrified Mounted Point, Abrasive Material Aluminum Oxide, Bond Type Vitrified, Overall Dia. 1 in, Overall Thickness 1 1/2 in, Shank Dia. 1/4 in, Grit 60, Shape W221, Shank Length 1 1/2 in, Specification 38A60-P, Operating Speed - Maximum 19,120 RPM, Series Gemini, Grade Medium, Compatible Tool Type Die Grinder, Straight Grinder