The hammer drill is similar to a regular electric drill, with the exception that it is provided with a hammer action for drilling masonry. The hammer procedure may be engaged or disengaged as required. 1. Comfortable feel the side handle 2. Quick pick chuck holding system 3. High structured aluminum fuselage, and internal resin shell , composition 4. High durability , high rigid double insulation of motor structure 5. High chushing damage performance and low vibration amd low noise