3M™ Cubitron™ II Hookit™ Clean Sanding Sheet Roll, 500+ Grade, 70mm x 12m (2.75"x40') Features 3M™ Precision-Shaped Grain-triangular-shaped grains that at least 30% faster and last at least 30% longer than other conventional ceramic abrasives. Clean Sanding multi-hole pattern delivers excellent dust extraction . 3M™ Hookit™- hook-and-loop style abrasive attaches firmly, removes quickly for fast change-out. Kiss- scoring technology allows for use in multiple sheet lengths. Sharper cutting surface means less pressure is required. Grains are electrostatically oriented on abrasive surface for efficient 34451