A46N - Aluminum. Aluminum ozide grain. Soft bond for aggressive cutting without loading. Use with reusable 5/8-11 adaptor to fit angle grinders. Non-ferrous metals (aluminum, copper, brass, etc.). Specifications: Max RPM - 12200. Tech Info: Type 1 shape for square, burr-free cutting. Special aluminum oxide formulation offers the fastest cutting, longest lasting thin wheels. Externally reinforced with fiberglass layers to provide ultimate safety in a thin wheel. Wide range of sizes available to fit both angle grinders and circular saws.