3M Hookit Blue Abrasive Disc 321U, 36165, 5 in, 320 grade, Multi-hole, 50 discs per carton, 4 cartons per case Our 3M Hookit Blue Abrasive Disc 321U delivers best-in-class performance at every stage of paint prep and body repair. Premium aluminum oxide mineral abrasive is blended with ceramic grain for a full range of automotive sanding applications. Our multi-hole discs feature a specially-designed pattern that reduces loading, extends disc life and aligns with most backup pads. Hookit attachment makes disc changes easy.
eBay