We designed the 3M™ Flap Disc 747D as a ceramic grain abrasive flap disc with a durable, X-weight cotton backing for working with stainless and carbon steels. Designed to run on a right angle grinder, a flap disc is a one-step alternative to bonded wheels and fiber discs. A unique grinding aid minimizes heat while maintaining life on heat sensitive alloys such as stainless steel.