DEWALT DCD999B 20V MAX with FLEXVOLT ADVANTAGE Lithium-Ion Brushless 3-Speed Hammer drill is part of the DEWALT's Bare tool line. Bare tools offer flexibility and value if you already own a battery and charger. It features a DEWALT-built high power, high efficiency brushless motor that delivers up to 57% more run time over brushed. This hammer drill is ideal for most drilling and hammering applications. DEWALT-built high power, high efficiency brushless motor delivers up to 57% more run time over brushed Heavy-duty 1/2-inch ratcheting nitro-carburized metal chuck with carbide inserts for superior bit gripping strength 3-mode LED provides lighting in dark or confined spaces up to 20X brighter than previous model