Zirconia Alumina Connector Size 3/8 in Connector Type Unthreaded Hole Grit 20 Overall Diameter 3 in Overall Thickness 1/4 in Compatible Tool Type Die Grinder Primary Material Applicationn Nickel Alloy Stainless Steel Steel Titanium Tool Steel Specification NV20-T Wheel Hardness T Wheel Type Type 1 Series BlueFire 4NV ZA Grade Extra Coarse Item Portable Snagging Wheel