DAMO 5” floor pads with 5.0mm thickness are specially designed to polish concrete or stone countertops and floors. They are made with top quality synthetic diamonds and resin. They fit most polishers with a 5” back holder. They also fit for planetary polishers such as DS301.A complete set comes with #50,#100,#200,#400,#800,#1500 and #3000.The Velcro backing could be attached to back holders easily and allows for a fast switching between pads. Different back colors with grit numbers burned into Velcro makes it easy to identify grit sizes. Polish from #50 to #3000 in order.