Metal grinding disc,diamond grinding disc,diamond polishing disc. 4,6,8,10 inch available. Metal grinding disc,diamond grinding disc,diamond polishing disc.1.DescriptionGritSizeCharacteristicsDiamond Grinding Disc50#,200#,400#4,6 ... renewing granite, marble,concrete,etc. After rough grinding and fine polishing with the pads, the floor surface will show a mirror effect.