This Black and Decker cordless hammer performs the action for drilling into concrete and masonry. It has 2 gears - high speed for drilling into wood and steel, low speed for controlled driving. The 24 torque clutch is perfect for screw driving into a variety of materials with different screws sizes. It also features a spring loaded slide pack battery system for a quick and easy battery change and a more secure fit. The variable speed provides ultimate finger tip control for all drilling applications whilst the reverse switch for added versatility.