3M Hookit Red Disc 316U, P40 7 Hole 50 Pack, 150mmOur 3M 51202 Hookit™ 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™ Hookit™ attachment system makes discs easy to attach and reuse.