General purpose snagging wheels optimized for all hard and soft metals are made of grade 57A aluminum oxide for heavy duty grinding and snagging. Grade 57A is a semifriable, fused brown aluminum oxide for cool, burn-free grinding of heat-sensitive metals and all steels. It balances cut quality and wheel life span at light to medium feed rates. Type 1 grinding wheels are flat and have the same thickness across the face and edge of the wheel.