400 Grit pads repair and remove scratches from the unpolished concrete, prepare the surface for lighter grits. For heavy-duty cleaning applications of worn concrete or cement-based terrazzo floors. 800 Grit pads remove scratches and prepare floor surface for micro-polishing. The starting point for all floor types, except concrete. 1500 grit pads continue to hone and sine the floor surfaces, and leave the surface prepared for the final steps of the polishing process. 3000 Grit pads effectively polish to a wet-look and should be used for daily maintenance. This step effectively maintains a high gloss and produces a clean, safe and shiny floor. Give life to dull, worn out floors and transform them into clean, glossy and brightly polished floors. Pads contain wear indicators, making it easy to determine when to replace them.