Aluminum Oxide Connector Size 1 1/2 in Connector Type Unthreaded Hole Grit 60 80 Overall Diameter 12 in Overall Thickness 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 Specification A/O MEDIUM 60/80 Wheel Hardness Not Rated Wheel Type Type 1 Maximum Operating Speed 2 070 RPM Reducer Bushing Size 1 in 1 1/4 in Series 57A Grade Medium