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Drill just rely on the motor to drive the drive gear to increase the strength of the drill bit rotation, so that the drill bit metal, wood and other materials to do the form of scraping holes.
The Impact Drill is equipped with adjusting knob,adjustable drill and impact drill in two ways. But the impact drill is used on the inner shaft gear beating each other to realize the impact effect, but the impact is far less than electric hammer. It can also drill reinforced concrete, but the effect is poor.
Hammer Drill is not the same, it is the use of the bottom of the motor drive two sets of gear structure, one to achieve it drilling, while the other is driven piston, like the engine hydraulic stroke, resulting in a strong impact force.