United Abrasives-SAIT 22047 Type 27 6-Inch x .045-Inch x 7/8-Inch A60S General Purpose Depressed Center Grinding Wheels, 50-Pack A60S - General Purpose. So unique it has a patent. Thin .045 width. Special aluminum oxide grain. Hard bond for extremely long life. Fast, burr-free cutting. Ferrous and/or non-ferrous metals (iron, steel, welds, etc.) Unique, thin Type 27 shape can be used on all angle grinders in accordance with ANSI B7.4 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