17 StonePro Diamond On Top Pad. Resin diamonds great for polishing concrete, terrazzo and stone. Easily mounts under your existing cleaning/polishing equipment; no new investments necessary. Will not leave swirls. Available in grits 50, 120, 220, 400, 800, 1800, 3000, & 8500. Available sizes in 7in, 17in and 20in pads.