Smirdex Velour Velcro Sanding Discs Dry Rub sanding discs 820 Series. Diameter 6 inch 150mm 7 holes. Suitable for sanding primers, putties and varnishes in the auto body repair and marine repair industries. Ideal for sanding all types of wood and composite materials. Semi latex paper. Open coat structure and stearate top coat to prevent clogging and loading. Aluminium oxide grain provides fast cutting and open coat provides high removal rates. Use with 150mm Velcro backing pad.