The 3M™ Hookit™ Low Profile Finishing Disc Pad is a soft density backup pad in 5 or 6-inch diameters for 5- and 6-inch abrasive discs. The soft density foam provides additional conformability and is ideal for final surface finishing applications following leveling and blending process steps. - 3M Hookit attachment provides excellent backing support and easy reuse, optimizing disc life. 5/16-24 External threads are compatible with orbital or random orbital sanders with 5/16-24 internal threads.