The bosch gdx 18 v-180 impact driver wrench is superb value and a unique bosch professional machine that combines an 18v impact driver and 18v impact wrench. using the 2 in 1 bit holder 1/4" internal hex drive and 1/2" external square drive, this tool is ready to tackle all applications. the gdx 18 v-180 bosch impact driver wrench offers the tradesman fast work progress due to the high speed and high torque of this machine, and is easily handled throughout any shift due to the new overall ergonomic design.