Vitrified Mounted Point Abrasive Material Aluminum Oxide Bond Type Vitrified Overall Dia 1/4 in Overall Thickness 1/2 in Shank Dia 1/8 in Grit 60 Shape B54 Shank Length 1 1/2 in Specification 38A60-P Operating Speed - Maximum 60 000 RPM Series Gemini Grade Medium Compatible Tool Type Die Grinder Straight Grinder