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.). Specifications: Max RPM - 12200. Tech Info: Unique, thin Type 27 shape can be used on all angle grinders in accordance with ANSI B7.1. 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.