3M™ Clean Sanding Disc 236U features a 3M proprietary multi-hole pattern that evacuates dust better than 5- or 6-hole products — dramatically increasing disc life. This aluminum oxide load-resistant disc is excellent for blending and finishing on aluminum and carbon steel, as well as woodworking applications for heavy and medium stock removal and finishing on hardwoods, softwoods, and composites. Clean sanding discs also work well on primer, paint, sealers, topcoats, fiberglass, and plastics. The strong, C-weight paper backing supports aggressive sanding and minimizes edge wear, and the 3M™ Hookit™ attachment system makes disc changes fast and easy, meaning that you can use the disc again and again for the extent of the abrasive life. For maximum dust extraction, use this disc with a Hookit Clean Sanding pad and a random orbital sander with vacuum (both sold separately).