A60S - Specialty. Thin .090" width. Special aluminum oxide grain. Hard bond for extremely long life. Excellent for notching and cutting. Ferrous and/or non-ferrous metals (iron, steel, welds, etc.). Specifications: Max RPM - 13500. Tech Info: Unique, thin Type 27 shape can be used on all angle grinders in accordance with ANSI B7.1. Special bond formulation offers the fastest cutting, longest lasting thin wheels. Externally reinforced with fiberglass layers to provide ultimate safety in a thin wheel. Super-Lock Hub on all 5/8-11 threaded wheels is the safest, vibration-free design.