Assorted 8 pieces of 100mm 4" DRY diamond marble polishing pads with a standard backer/holder. They are heavy duty and Velcro backed pads in GRIT 50 (Blue), 100 (Yellow), 200 (Orange), 400 (Red), 800 (Green), 1500 (Cyan), 3000 (Brown), and 10000 (black buff), total 8 pcs. The holder connects to many different machines with a standard 5/8-11 thread arbor. Recommended RPM is 2000-4400. Suitable for polish the granite, marble and all kind of natural stones. no water is needed when use. Dry polishing pads should be in hexagon figure as shown in picture. Some seller sells wet polishing pads as dry type.