United Abrasives-SAIT 22345 Cutting Wheel Type 27 A46N, 4-1/2-Inch by .045-Inch by 7/8-Inch, 50-Pack A46N - Aluminum (Non-Ferrous Metals) Aluminum oxide grain. Thin .045 width. Soft bond for aggressive cutting without loading. Non-ferrous metals (aluminum, copper, brass, etc.) Unique, thin Type 27 shape can be used on all angle grinders in accordance with ANSI B7.2 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