GMC 2 Gear Hammer Drill (850W) - 920273 Magnesium construction provides superior strength, lighter weight & increased durability. 850W motor provides plenty of power for all drilling application, with 2 speed gearbox enabling selection of the optimum speed & torque for each task. Hammer action allows fast drilling into masonry and brick, with variable speed and 360� adjustable side handle enabling improved control and accuracy.