The 3M™ Hookit™ Clean Sanding Disc 236U features an innovative multi-hole design for improved dust extraction in finishing applications. 3M’s proprietary multi-hole pattern helps evacuate dust better than 5 or 6 hole products — increasing cut and dramatically increasing disc life. Open coat construction and a load-resistant coating further prevent clogging.The 3M Hookit Clean Sanding Disc 236U is constructed of aluminum oxide and is suitable for finishing applications on wood as well as primer, paint, sealers, topcoats, fibreglass, and plastics. The 3M Hookit Hook-and-Loop Attachment System makes disc changes fast and easy, meaning the disc can be used again and again for the extent of the abrasive life.