3M Xtract™ Hookit™ Low Profile Back-up Pads are firm yet flexible to provide versatility for flat sanding applications and are designed to securely hold a 3M Xtract™ Hookit™ Disc on a random orbital sander (sold separately). Part of the 3M Xtract™ Series, designed for optimal dust removal, , enabling a vacuum to extract dust off the workpiece to prolong disc life and enhance productivity. Use this back-up pad with coarse grades where good leveling is needed.