Makita LXT4 18-Volt Lithium-Ion Cordless 1/2-Inch Impact Wrench and 7/8-Inch Rotary Hammer Kit More Power: Makita Built 4-Pole Maximum Torque Motor delivers more efficient power than the competition More Work: LXT Battery and optimum charging system produces 280% more total lifetime work with 2-3X more cycles Less Weight: 40% lighter than other 18V systems Better Fit: Comforable Ergonomic Shape allows for all-day use with less fatigue 18Volt Power with 12Volt Weight