Aluminum Oxide Connector Size 1 in Connector Type Unthreaded Hole Grit 150 Overall Diameter 8 in Overall Thickness 1 in Compatible Tool Type Bench Grinder Pedestal Grinder Primary Material Applicationn Tool Steel Wheel Hardness Not Rated Wheel Type Type 1 Maximum Operating Speed 3 600 RPM Reducer Bushing Size 5/8 in 3/4 in 7/8 in Series Premium Alundum Grade Very Fine Bond Type Vitrified Color White Item Straight Grinding Wheel