Tianli 8-Inch 10mm Thick Resin Bond Diamond Grinding Pad: Used to remove deep scratches left by metal discs, or to initially refine rough concrete/terrazzo surfaces, creating a smooth base for the subsequent fine white polishing pads.with 8-inch floor polishing machines. Usage method: Wet grinding recommended (or with minimal water spray). Dark resin pads tend to burn and glaze easily during dry grinding.