The 3M Roloc Disc 361F TR is an aluminum oxide disc constructed on a water-resistant, YF weight, polyester cloth backing. It is resin bonded for heat resistance and can be run wet or dry.
3M Stikit Red Abrasive Disc 316U is an adhesive backed abrasive disc intended for rough featheredging and filler shaping. The adhesive backing allows for easy attachment and removal where DA sanding...