Zirconia Alumina Connector Size 5/8 in Connector Type Unthreaded Hole Grit 16 Overall Diameter 8 in Overall Thickness 1 in Compatible Tool Type Die Grinder Primary Material Applicationn Nickel Alloy Stainless Steel Steel Titanium Tool Steel Specification 4NZ16-QBS-X406 Wheel Hardness Q Wheel Type Type 1 Maximum Operating Speed 6 000 RPM Series BlueFire Grade Extra Coarse Bond Type Resin Color Black Item Straight Grinding Wheel