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3M Drywall Sanding Screens. Medium Grit. Die-cut to fit most drywall sanding tools designed for sanding drywall joints as well as patching compounds and plaster to a fine finish. Also used on wood, metal, plastic and painted surfaces. Sharp silicon carbide abrasive lasts long, cuts fast. Open-mesh cloth backing reduces loading and allows use of both sides. Rinse to reuse. Works best with light pressure, can be run wet or dry.