3M 3″ 777F ROLOC GRINDING DISCS – A 3M™ ceramic grain Roloc™ disc constructed on a YF-weight, water resistant polyester cloth backing. Resin bonded for heat resistance. Can be run wet or dry. Features grinding aid which enhances performance on stainless steel and other exotic alloys. Recommended in offhand and pressure grinding on all exotic metal alloys. Sold by the individual disc.