Aluminum Oxide Connector Size 5/8 in Connector Type Unthreaded Hole Grit 16 Overall Diameter 6 in Overall Thickness 1 in Compatible Tool Type Die Grinder Primary Material Applicationn Aluminum Brass Bronze Cast Iron Copper Nickel Alloy Stainless Steel Steel Titanium Tool Steel Specification 57A16-QS Wheel Hardness Q Wheel Type Type 1 Maximum Operating Speed 8 000 RPM Series 57A Grade Extra Coarse Bond Type Resin Color Black Item Straight Grinding Wheel