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