Vitrified Mounted Point, Abrasive Material Aluminum Oxide, Bond Type Vitrified, Overall Dia. 3/4 in, Overall Thickness 1/8 in, Shank Dia. 1/8 in, Grit 90, Shape W200, Shank Length 1 1/2 in, Specification 38A90-Q, Operating Speed - Maximum 50,930 RPM, Series Gemini, Grade Fine, Compatible Tool Type Die Grinder, Straight Grinder