The ACDelco Li-ion 20V Brushless Two-Speed Hammer Drill, No. ARK20129, offers a slim and extended body design that positions the brushless motor further back from the gearbox, providing a better balance in hammering mode, the company says. It can deliver up to 3,000 bpm, and the load speed can drill at 600/2,000 rpm. The tool features a two-speed metal gearbox housing, variable speed with reversible and electronic brake control precision, 18-mode torque settings, built-in LED and batter power indicator.