M18 18-Volt Lithium-Ion Brushless Cordless Hammer Drill/Impact/Caulk Gun Combo Kit (3-Tool) with 4-BatteriesThe M18 Cordless System's patented technologies and electronics, innovative motor design and superior ergonomics provide the most efficient blend of power, weight and performance in the industry. The M18 Brushless Hammer Drill Driver is the Most powerful drill in its class at 725 in. lbs. of torque. The M18 1 4 in. Hex Compact Brushless Impact Driver has the fastest application speed its class and delivers 1,600 in. lbs. of torque. Both tools feature