Makita HR3520B Information The Makita HR3520B is a 840-watt rotary hammer drill that is designed for medium to heavy-duty demolition work. It features two modes of operation: hammer only and hammer/drill. The hammer only mode is ideal for breaking up concrete, brick, and masonry, while the hammer/drill mode can be used for drilling holes in concrete, brick, and wood. The HR3520B has a powerful motor that delivers up to 6.2 joules of impact energy, making it capable of breaking through even the toughest materials. It also has a variable speed trigger that allows you to control the speed of the hammer and drill, and a reversing switch that makes it easy to remove drill bits that have become stuck. The HR3520B is equipped with a number of features that make it a safe and easy-to-use tool. These features include a soft start function that prevents the tool from stalling when it is first turned on, an electric brake that stops the hammer action immediately when the trigger is released, and ...