3M 36520 3M™ Hookit™ 50PK Blue Abrasive Disc 36520, 40E, 6 in (150 mm), Dust-Free, 3M Model No.7100363515

3M™ Hookit™ Blue Abrasive Disc 521U is a paper-backed abrasive disc with excellent performance and cut. It is available in a range of grades and sizes. Use the 3M Hookit Blue Abrasive Disc 521U for sanding on collision repair substrates like paint, primer, metal and composites. It is a fast-cutting paper-backed disc with durable E-weight paper backing for excellent cut and long lasting performance. The Hookit system features hook-and-loop attachment for easy, reusable application.