3M Hookit clean sanding sheet 236U for blending and finishing on aluminum and carbon steel and for woodworking applications such as heavy and medium stock removal and finishing on hardwoods, softwoods and composites. This sheet also works well on primer, paint, sealers, topcoats, fiberglass and plastics. Designed for use with a rectangular orbital sander, the strong C-weight paper backing resists tearing and edgewear during aggressive sanding and the sheet is resin bonded for heat-resistance, further increasing life and cut. This sheet also features an open coat and a load-resistant coating to enhance dust management and cut-rate. - 3M Hookit clean sanding sheet 236U offers superior dust control, aggressive cut and long life on a premium aluminum oxide sheet with a durable edge and convenient 3M Hookit attachment. It features a proprietary multi-hole Clean Sanding pattern that evacuates dust better than traditional sheet product.