Hammer drill is a hand-held electric tool that combines two functions of impact drill and electric hammer. It uses the bottom motor to drive two sets of gear structures. One set is used to drill, and the other set drives the piston, which is like a hydraulic stroke of an engine, producing powerful The impact force is accompanied by the effect of the drill. When in use, just apply a little force at the beginning to make the drill move forward automatically. It is mostly used for grooving and opening large holes in concrete, bricks and other materials.
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