3M 947D Flap disc provides a system for low-pressure grinding, small weld removal, finishing and surface preparation with just one disc. The one-step alternative to bonded wheels and fiber discs, these discs run fast enough for stock removal but provide cushioning with the flaps for a soft finish. - 3M 947D Ceramic grain abrasive flap disc constructed on a X-weight, durable cloth backing. Resin bonded for heat resistance. Effective for preparing stainless steel for #3 and #4 finishes.