The A24N has a soft bond for fast stock removal. Constructed with the highest quality aluminum oxide grain assures consistent high-stock removal for tough applications. Expect uniform grain throughout, no filler grain is used in the backing. Internally reinforced with fiberglass for maximum safety. Type 27/Type 42 shape. Unique Super-Lock Hub combines a mechanical locking system with a chemical bond to provide one of the safest, vibration-free designs in the industry. Used for low-grade stainless steel and ferrous metals such as iron, steel, welds, etc. Package of 10.