The Bit/Socket Impact Driver delivers results with a two-in-one Bit/Socket drive which offers a 1/4 quick change hex drive for bits and a 1/2 square drive for sockets. Two-in-one drive improves convenience and power. Bits can stay inserted comfortably when using deep sockets and more torque is transmitted directly through the 1/2-inch square drive anvil. No more torque loss due to socket adapters or broken socket adapters. Powerful and efficient brushless impact wrench motor delivers up to 1860 inch-lbs of torque and 0-4200 bpm. In addition to three speed/torque settings, this impact driver also has special modes to prevent damage to the workpiece and fasteners.