? Screen Sheet,Screen Sheets ? Screen-Bak Durite Q421 fine grit screen sheets are a great choice for efficiently sanding and finishing fiberglass and composites; aluminum, brass, bronze, titanium and super alloys; hard, soft, and 300-series stainless steels; and hard and soft woods. Engineered with a P-grade silicon carbide abrasive, these open-weave screen sheets deliver excellent cutting, and remove scale, rust and corrosion with minimal loading. They're waterproof, so rinse and reuse them for final sanding applications and light material removal. They're packaged in a handy protective dispenser to reduce waste and make storage simple. ? P-graded silicon carbide for excellent cutting and non-loading properties ? Open weave screen for extreme resistance to loading when removing scale, rust and corrosion ? Waterproof and washable; screen sheets are packaged in a protective, convenient dispenser which eliminates costly waste and permits neat, easy storage ? A good choice to rinse and reuse for light material removal and final sanding ? 180-320 grit recommended for finishing