Aluminum Oxide Connector Size 1 in Connector Type Unthreaded Hole Grit 36 46 Overall Diameter 6 in Overall Thickness 1/2 in Compatible Tool Type Bench Grinder Pedestal Grinder Primary Material Applicationn Aluminum Brass Bronze Cast Iron Copper Nickel Alloy Stainless Steel Steel Titanium 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 57A Grade Coarse Bond Type Vitrified