Aluminum Oxide Connector Size 3/8 in Connector Type Unthreaded Hole Grit 24 Overall Diameter 3 in Overall Thickness 1/2 in Compatible Tool Type Die Grinder Primary Material Applicationn Aluminum Brass Bronze Cast Iron Copper Nickel Alloy Stainless Steel Steel Titanium Tool Steel Specification 57A24-PBRA Wheel Hardness P Wheel Type Type 1 Maximum Operating Speed 18 080 RPM Series 57A Grade Extra Coarse Bond Type Resin Color Black Item Straight Grinding Wheel