The exhausting load created by the angle-grinder’s weight and its vibrations place heavy demands on a man’s strength. Any sign of fatigue in the worker has an immediate effect on the result of his work, and thus on productivity. That is why the ratio between weight and power in a tool comes into focus when selecting the right industrial tool. With their incredibly favorable power-to-weight ratio (kW/kg), the innovative turbine angle-grinders, powered by compressed air, score highly here, thus representing a convincing alternative to conventional devices. The power-weight ratio (kW/kg) comes to just half of that of an air vane motor. Everything speaks in favor of a turbine drive over an electrical grinding machine. A comparable electric grinder with an output of 2 kW weighs in at a whopping 6.6 kg, while the turbine angle-grinder, with a higher power output of 2.2 kW, weighs just 2 kg. The new 4.5 kW (6 HP) output DEPRAG turbine angle-grinder tips the scales at just 4 kg. Both power classes of DEPRAG turbine grinders achieve an unbeatable power-weight ratio of 1:1!