3M Stikit Red Abrasive Disc 316U is an economical disc that delivers reliable performance. It features aluminum oxide mineral abrasive on A-weight or durable D-weight paper backing depending on grade. These discs are ideal for standard jobs such as filler shaping, featheredging, paint prep and finish. Our 3M Stikit attachment makes disc change-outs fast and easy. Sold by the box.