Our sanding screens are made with fast cutting silicon carbide that is bonded on both sides for double life. The open mesh screen allows sanding dust and particles to pass through, reducing clogging. The premium double resin bonding system resists heat and is waterproof for wet or dry sanding. Use 180 220 grit for final surface sanding prior to painting For use on drywall, plaster, varnish, fiberglass, paint and metal The open mesh allows dust and particles to pass through to reduce clogging Dual-sided abrasive surfaces for longer life; turn screen over to expose a fresh cutting surface The waterproof screen can be rinsed clean with water and reused Series Name: Precut Drywall Sanding Screen Type: Sheet Diameter in Inches: N/A Length (Inches): 11.25 Width (Inches): 4.25 Attachment Method: Clamp Durability: Commercial Mineral: Silicon carbide Package Quantity: 25 Sanding Grade: Extra fine Sanding Grit: 220 CA Residents: Prop 65 Warning(s): No UNSPSC: 23131500