100% ceramic mineral, Long life, Fast cutting, Cool running, Good for sharp edge work and flat finishing A 3M™ ceramic grain abrasive flap disc constructed on a X weight, durable cloth backing. Resin bonded for heat resistance. Features grinding aid for cooler grinding. 3M™ Flap Discs offer an unbeatable system for grinding and blending in one easy step. The construction wears away, exposing fresh mineral to extend disc life and provide consistent cut rates. Great for weld grinding, blending, deburring, rust removal, surface prep and edge grinding on all types of metals. Available in both T29 or T27 constructions with or without the 5/8 11 inch hub.