737U | Diameter 5″ | Grit 320+ | 50 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. Extremely sharp precision-shaped grain provides longer life than conventional ceramic abrasives 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. Long lasting, fast-cutting abrasive disc is ideal for a range of jobs, including paint removal and feather-edging removal and featheredging.