United Abrasives- SAIT 60665 Closed Coat Aluminum Oxide 4-Inch x 36-Inch LA-X 60 Grit Sanding Belt, 10-Pack LA-X: Economy Aluminum oxide, closed coat, X-weight cotton. For low cost sanding and finishing of ordinary and alloyed steels, ferrous and non-ferrous metals, cast iron, and wood. A good choice where price and best value is the determining factor.