Our Cubitron II Hookit Clean Sanding Abrasive Discs 737U combines the highest 3M technologies for automotive repair. Its long-lasting sharp triangular shaped grain and multi-hole pattern for superior dust extraction make the disc ideal for paint removal, rough body filler shaping, fine feather-edging or final prep before blending or priming. The Hookit system makes for quick disc change-outs.. We developed our Cubitron II Hookit Clean Sanding Abrasive Discs 737U for superior cut and long disc life during key stages in auto body repair. It features 3M Precision-Shaped Grain technology. This triangular shaped grain cuts at least 30% faster and lasts at least 30% longer than traditional ceramic abrasives. The disc is ideal for feather-edging, as a final sanding step before priming, or during prep before blending.