Mercer Industries floor sanding sheets are made with 100% sharp silicon carbide grain. Available in grits 20, 36, 60, 80 and 100. The 12" x 18" sheets fit square buff machines as well as Clarke, deva, and Silver line. These sheets have enough grit on the backside to adhere to a sanding pad. Made with high quality resins and grains for excellent durability and life. Use to repair and refinish wood floors.