3M Xtract Paper Disc 236U features a 3M proprietary multi-hole pattern that evacuates dust better than 5- or 6-hole products — dramatically increasing disc life. The design achieves an ideal balance between the abrasive surface and dust extraction holes to maximize cut and optimize the life of the disc.3M Xtract Paper Disc 236U 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. Our clean sanding discs also work well on primer, paint, sealers, topcoats, fiberglass, and plastics. The strong, C-weight paper backing on our 3M Xtract Paper Disc 236U supports aggressive sanding and minimizes edge wear. An open coat means the abrasive grains have space between them so that dust escapes through the spaces rather than loading the cutting edge of the grains. The load resistant coating allows the disc to continue cutting even when sanding softwoods, paints, and other materials that would, otherwise, clog the disc and hinder sanding ability. Sandpaper discs cut better and last longer when dust isn't loading the cutting surface of the abrasives. Reducing dust is easier than ever with 3M Xtract Discs, designed for optimal dust removal. For maximum dust extraction, use this disc with a 3M Xtract Back-up pad and a random orbital sander with vacuum (both sold separately). Our proprietary multi-hole pattern on 3M Xtract products removes dust at a higher rate than 5- or 6-hole products.Our proprietary multi-hole pattern evacuates dust from the disc at a high rate. This hole design doesn't even require alignment of holes with the disc pad (which is attached to a random orbital sander and sold separately), making disc changes quick and simple. The 3M Hookit attachment system uses a hook and loop design that makes disc changes fast and easy. All of this adds up to improved productivity and reduced material consumption.