3M 31375 Cubitron II Hookit 8 in. Our Cubitron II Hookit Clean Sanding Abrasive Discs 737U combines the highest 3M technology for automotive repair. Its long-lasting 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.