The electric hammer is a kind of electric rotary hammer drill with safety clutch attached with a pneumatic hammering mechanism. The electric hammer uses the principle of piston motion to compress the gas to impact the drill bit. It does not require much effort to use hands. It can open 6-100mm holes in hard materials such as concrete, brick, stone, etc. The electric hammer has a high efficiency in opening holes in the above materials, but it cannot open holes in metal.