Aluminum Oxide Connector Size 1 1/2 in Connector Type Unthreaded Hole Grit 24 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 Gemini 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 Extra Coarse