These Metal bond diamonds come in 10 seg and 6#, 16#, 30#, 50#, 100#, 200# and 400# grit. Bond: Soft, Medium Hard, Hard.. Aggressive grinding with smooth profile and virtually no scratch. Optimal for salt and pepper finish. This tool has exceptional life and even wear as they flex to contour of the floor. Designed to be run wet and will not darken the floor. Suitable for Xingyi, CPS, ASL etc concrete grinding machine.