Bosch 18V Impact Driver Kit18V Two In One 1 4 In. and 1 2 In. Bit Socket Impact Driver Wrench Kit with 2 Ah Standard Power Battery Two in one impact driver wrench features a 1 4 In. hex shank and a 1 2 In. square drive, for using either bits or sockets Powerful brushless motor delivers a max of 1,800 In. Lbs. of torque and up to 4,200 ipm for professional power Versatile driver wrench eliminates using socket adapters, delivering more torque directly through the 1 2 In. square