Vitrified Mounted Point Abrasive Material Aluminum Oxide Bond Type Vitrified Overall Dia 11/16 in Overall Thickness 7/8 in Shank Dia 1/4 in Grit 60 Shape A14 Shank Length 1 1/2 in Specification 38A60-P Operating Speed - Maximum 55 560 RPM Series Gemini Grade Medium Compatible Tool Type Die Grinder Straight Grinder