FLEXCUT, the leading flexible grinding wheel for over 25 years, is specially formulated to deliver superior removal on all ferrous and non-ferrous metals without clogging or loading. Wheels are free of iron, sulphur and chlorine (Fe-S-Cl) and are guaranteed not to contaminate stainless steel. A 5/811 threaded arbor for Spin-On mounting reduces downtime for wheel changes and helps you finish your toughest grinding jobs faster. Always use with flange WAL30B057. For use with aluminum, steel, stainless steel and non-ferrous metals. Package of 25. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.