3M Wetordry 99421NA Sandpaper, 11 in L, 9 in W, Extra Fine, 320 Grit, Silicon Carbide Abrasive, Paper Backing

Primarily used in the metalworking and woodworking industries, the 3M Wetordry paper sheet, 413Q, is a silicon carbide, closed coat product bonded with a waterproof resin. It works well for sanding old finishes, fine featheredging, surface work and can be used wet or dry.