Conducting repair and construction work today is not without special electrical units. They increase work efficiency, accelerate the construction process, make it better. Such instruments include a grinder that can be grinded, cut, cleaned by different elements. The principle of operation of the tool is simple, but quite effective. The movement of the brush or disk is carried out by the electric motor. Work by a grinder requires attention and clear compliance with safety rules. Such a tool should also be purchased for personal use. But the choice should be approached responsibly so as not to throw money away. When choosing a tool, the alleged types of work and their complexity are necessarily taken into account.