SAIT Part number 23174. Cutting Wheel Type 1, 4-1/2 X .045 X 7/8. High performance, ceramic aluminum oxide grain. Very uniform, high density grain structure is extremely durable and self sharpening for long life and cooler cut. Use with 5/8-11 adaptor to fit angle grinders. Combines fast cutting with extremely long life. For use on Metal, Stainless. Maximum RPM: 13,300. Thickness: .045 inch. Arbor: 7/8.