Powerful impact driver design – features a 1/4 in. Hex, an efficient EC Brushless motor and variable-speed trigger CORE18V battery – provides next-gen li-ion 21700 Cell technology in a lightweight, high-power battery with optimal performance Eco Brushless motor – delivers a max of 1, 800 in. -Lbs. Of torque and up to 4, 000 impacts per minutes (IPM) for professional power Compact Impactor design – features a head length only 4. 9 in. (Giving it the best head-length-to-torque ratio on the market) and a weight of only 2. 4 lbs. (Tool only, not including battery) Variable-speed trigger – allows user to control speed of impact driver