CGW Contaminate Free Quickie Cut-Off Wheel, Type 01, 4-1/2"D x .45" Thickness - 52-001-116 Contain ≤0.1% iron, sulfur or chlorine for rust-free and corrosion-free results.White aluminum oxide grain for stainless steel, food grade and nuclear applications.High quality grain mixture is more friable and cuts freely.Less cutting resistanceLess dust generation & workpiece waste.Hole Thread Size: No ThreadHole Size: 7/8"Grade: Medium