A concrete grinder can come in many configurations, the most common being a hand-held Angle grinder, but it may be a specialized tool for countertops or worktops. There are also purpose-built floor grinders that are used for grinding and polishing marble, granite and concrete. Machines that grind concrete floors are usually made to handle much more stress and will have more power to drive the unit as concrete has much higher sliding friction than marble or granite which is also worked wet, therefore with less friction. In fact, some types of marble will spark when it is ground dry, causing deep damage to the marble surface.
All concrete grinders use diamond segment pads or diamond resin pads to grind or polish. The diamond tools used for grinding most commonly are diamond grinding cup wheels, and for polishing are usually diamond polishing pads. The use of diamond tooling is the most common type of abrasive used under concrete grinders and come in many grits that range from 6 grit to the high thousands, although 1800 grit is considered by the insurance industry as the highest shine to apply to a floor surface.