I have a snappy 1/2 18v, 3/8 14.4v, and 1/4 7.2v. They are some of the most efficient tools in my box. 1/2 for lug nuts and crank pulley bolt, axle nuts etc. 3/8 for general use --- top of engine, suspension stuff. 1/4 makes quick work of a dash tear down. Nic... Login to read more.