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. 20 – Precut sheets for any 12″ x 18″ buffer – square buff, Clarke, deva, silver line. For hardwood or concrete Silicon Carbide grain gives a consistent performance at a competitive price Extra Heavy weight paper backing provides extra durability, high tear resistance Backside of sheet has enough grain on it to adhere to a sanding pad Available in grits 20 through 100 for all your sanding needs.