The impact drill GSB 21-2 RCT Professional is the most powerful tool in its class, the best for the toughest applications. It has a Bosch high-performance motor (1300 W) for the most heavy-duty applications with large diameters for drilling, screwdriving and stirring.It can keep the speed constant, even under load.It has a robust metal gear housing for a long lifetime.The antirotation mechanical overload clutch is for a high level of work safety, even in the toughest applications.The spindle collar diameter is 43 mm.