【Durable and Powerful Motor】Robust 6.7A copper motor which provides 1200 no-load RPM and 0-4000 BPM optimizes the durability and performance. Up to 2.1ft.lbs/ 2.8 joules impact energy allows for most of toughest applications. 【Multi-function Selector】4-mode operation: drill only, rotary hammer, chisel rotation only and hammer only for drilling on concrete, cement, brick, wood and rock. Variable Trigger with lockable switch optimizes the drilling accuracy and reduce the fatigue. 【Rugged Quality and Reliability】Engineered cooling mechanism with large ventilate construction allows for More effective heat dissipation and higher overload capacity. Sturdy structure extends the tool lifetime. 【High-Efficient Work】1inch SDS-Plus chuck for quick bit change and variety of demanding applications. 360°auxiliary anti-vibration handle with all-metal depth rod increased the controllability and stability. 【Ergonomic and Comfortable Design】Ergonomic design rubberized grip for maximum comfort and control.Vibration reduction mechanism reduces vibration felt by the user at the handles. 【What’s in the Box】(1)Corded Rotary Hammer Drill, (4)SDS-Plus Drilling/Drill Bits,(2)Carbon Brushes,(1)Auxiliary Handle,(1)Adjustable Depth Stop Rod(1)User Manual. DongCheng SDS-Plus Rotary Hammer Drill with Safety Clutch