Hard bond for smooth cutting.For use in nuclear, aerospace, automotive, foundry industries, and plant maintenance., Type 1/Type 41 shape for square, burr-free cutting.Externally reinforced with fiberglass layers to provide ultimate safety in a thin wheel.Type 1/Type 41 Cut Off Adapter (1/4" shank adapters for wheels up to 3" diameter) available in Accessories. Cut-Off Adaptor.