CS Unitec Drywall Dust Free Sanding Abrasives Home › CS Unitec Grinding, Blending and Polishing Discs › CS Unitec Drywall Dust Free Sanding Abrasives We currently do not have any products for this manufacturer. Please check back soon for new products... If you would like to place an order over the phone please call 800-242-4424 for immediate assistance. Thank you. 9" Diameter. Vacuum hole with Hook and Loop Backing for sanding joint compound, paint, lacquer, and wood. Used as an accessory for CS Unitec's 9" drywall sander.