Norton cut off wheels are made of a quality aluminum oxide grain that provide fast and aggressive cutting speeds, great for PROs and DIYers These cutting discs are designed with a proprietary bond technology for long life and more cuts per wheel Cutoff wheels to be used with a right angle grinder for everyday metal cutting applications 4.5 cut off wheels are ideal for cutting metal and alloys , including mild steels, 400 series stainless, and other ferrous metals , fiberglass, iron Pack of 50 cutoff wheels