Concrete grinding is the process of removing high points, contaminants, and loose material from a concrete surface using a grinding machine. When grinding concrete, the bond of the diamond cup wheels should normally be the opposite of the concrete, ie use a soft bond on hard concrete, and a hard bond on soft concrete. Use a larger diamond grit (lower number) for faster removal of concrete and for harder concrete.    Diamond grinding wheel for concrete is a kind of superhard tool made by sintering metal bond and diamond powder, which is used for leveling and polishing of concrete floors. It can also be used for polishing terrazzo and epoxy floors. It can be used on angle grinders and floor grinders.