Black&Decker Hammer drill

2-speed gearbox - high torque in 1st gear, and high speed in 2nd gear. The cast aluminum gearbox housing provides optimal heat transfer and increases durability and tool life of a 13 mm metal quick-release chuck with automatic spindle locking The 850 W AC motor provides increased power output and torque to perform a wide variety of jobs. The speed dial allows you to select the speed you want. more control The reversible brush system provides maximum power with forward and reverse rotation and reduces brush wear.