737U | Diameter 8″ | Grit 40+ | 25 Discs Per Box Features 3M Precision-Shaped Grain, triangular-shaped grains that cut at least 30% faster and last at least 30% longer than other conventional ceramic abrasives. A sharper cutting surface means less pressure is required. Clean Sanding multi-hole pattern delivers excellent dust extraction. 3M Hookit hook-and-loop attachment makes for fast disc change-outs. Extremely sharp precision-shaped grain provides longer life than conventional ceramic abrasives.