Special zirconium grain formula.Hard bond for extremely long life.Fast, burr-free cutting., Type 1/Type 41 shape for square, burr-free cutting.Externally reinforced with fiberglass layers to provide ultimate safety in a thin wheel.Unique formulations offer the fastest cutting, longest lasting thin wheel.Wide range of sizes available to fit both angle grinders and circular saws.Reusable 5/8-11 adapter for use on Type 1 / Type 41 reinforced wheels with a 7/8 arbor, and a maximum diameter of 5" and a wheel thickness of .045" to 1/8" is available in accessories. Part #95055.