Product Introduction Hammer drilling machines in series of concrete, brick, stone, wood, etc. drilling, cutting with a chisel function, can be a cutting of operating the electric speed control and positive and functions to operate more handy. Type hand with the handle, in line with the best human engineering design. Fuselage adoption of nylon so that it can be difficult to damage variable in the best new control technology innovation, and establish speed model. As the full impact of improved performance, regardless of how hard concrete, drilling work can be completed quickly.