The hammer drill has a powerful copper motor with 0-4000/min impact rate and 1100 r/min no-load speed to quickly accomplish all kinds of work. This 3-in-1 electric hammer drill can effectively complete your work projects. 3 functions including drill mode hammer mode and hammer drill mode can apply to different working tasks with variable speed trigger to control the suitable speed by yourself. And it has a special reverse and forward switch and SDS-plus quick change drill chuck for better operation. Full drill set with 360 rotation auxiliary handle and detachable depth rod give you a lot of convenience to make the work more precise and easier. Combine with so many advantages it is worth buying. If you are looking for hammer drill don't hesitate to buy one. --3 functions to switch from drill hammer drill hammer to be more multi-functional --Heavy-duty copper motor is more durable and powerful --360rotating auxiliary handle to operate easier and can be removed for different needs --Detachable scaled depth gauge to decide precise drilling depth --Light weight and ergonomically designed handle to reduce fatigue when holding --Variable speed can be controlled by your own finger --Bidirectional switch can make drill forward or reverse to remove stuck drill --A lock-on button can hold on the operation for to make it easier --SDS-plus quick change drill chuck has maximum impact energy transfer --Safety clutch can protect the tool will guarantee the user's safety --UL-certificated ensures the better quality --Full drill set can meet overall needs