The black decker bdchd18k 2 speed combi drill has a hammer action for drilling into concrete and masonry with 2 gear speeds high for drilling into wood and steel low for controlled driving it also has a 10 position clutch that provides precise control for drilling into wood metal plastic and all screwdriving tasks it has an anti slip soft grip for additional comfort and an led work light to illuminate dark working areas it uses a spring loaded battery system for quick and simple battery change