Vitrified Mounted Point Abrasive Material Aluminum Oxide Bond Type Vitrified Overall Dia 1 1/8 in Overall Thickness 1 1/8 in Shank Dia 1/4 in Grit 60 Shape A13 Shank Length 1 1/2 in Specification 38A60-P Operating Speed - Maximum 33 950 RPM Series Gemini Grade Medium Compatible Tool Type Die Grinder Straight Grinder