7 Pcs of 5" Diamond Polishing Pad (3mm Thick) for concrete stone. * 7 Pads are: 1 X Grit 50 100 200 400 800 1500 3000. * 2 Pcs of 5" Diamond Double Row Grinding Cup Wheel for concrete grinding. * Cup wheel are non-threaded, inner hole diameter 7/8"-5/8" spacer/washer included.