ENGiNDOT 12.3 Amp Rotary Hammer Drill has 4 modes for rotation, hammering with rotation, chisel, hammering only, so users can adjust tool settings based on the application and material. And it also equipped with SDS-Plus chuck & 1/2 keyless chuck, which are designed to improve your work efficiency. In addition, it has impact frequency 0-4350BPM, can achieve 0-900RPM, which can complete heavy duty projects on concrete, masonry and metal, thus concrete contractors, framers and other construction pros can use this hammer to get more work done more easily. What’s more, the unique heat dissipation system and Vibration Damping Technology of this hammer drill can effectively extend its service life. The 12.3A motor with 7JOULES5.2 ft. /lbs impact energy, 0-4350BPM, 0-900RPM, It optimal to complete work projects on concrete, metal, brick, stone and masonry, etc. /lbs impact energy, 0-4350BPM, 0-900RPM, is optimal to complete work projects on concrete, metal, brick, stone and masonry, etc. Drilling capacity: 1-1/4 inch for concrete, 1-9/16 inch for wood, 1/2 inch for steel; With a 6-level variable speed dial, you’ll always keep in total control of your tool. 4 FUNCTIONS in ONE KNOB. Just switch the dial to convert between Drilling To drill material such as wood, steel, etc. / Hammer drilling (To drill concrete, granite, brick)/ Chisel position adjustment (Adjust the angle of the chisel before use)/ Chiseling (For chipping work on hard materials). Integral clutch reduces sudden and high torque reactions if bit jams, providing you high security during the heavy-duty projects; The 360° Rotating Handle and Metal Depth Gauge offer more precise control. Perfect for tough tasks such as demolishing brickwork, removing plaster, taking off tiles and digging out old grouting, etc. Suitable for drilling into materials including wood, masonry, concrete, and metal.