Vitrified Mounted Point Abrasive Material Ceramic Bond Type Vitrified Overall Dia 1/2 in Overall Thickness 2 in Shank Dia 1/4 in Grit 80 Shape W189 Shank Length 1 1/2 in Specification 3NQ80 Operating Speed - Maximum 24 000 RPM Series Quantum Grade Medium Compatible Tool Type Die Grinder Straight Grinder