Aluminum Oxide Connector Size 1 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 6 in Overall Thickness 3/4 in Compatible Tool Type Bench Grinder Pedestal Grinder Primary Material Applicationn Tool Steel Wheel Hardness Not Rated Wheel Type Type 1 Maximum Operating Speed 4 140 RPM Reducer Bushing Size 1/2 in 5/8 in 3/4 in 7/8 in Series Premium Alundum Grade Medium Bond Type Vitrified Color White Item Straight Grinding Wheel