The Bosch CLPK251-181 18V Cordless Combo Kit is a convenient package with two complementary cordless tools. Included is the IDH182 1/4" and 1/2" Socket-Ready impact Driver and the HDS183 Compact Tough™ 1/2" Hammer Drill/Driver. THe IDH182 EC Brushless 1/4" and 1/2" Socket-Ready Impact Driver Impact Driver is able to switch from 1/4" to 1/2" sockets, for an all in one tool with plenty of driving power. It provides contractors, carpenters and other pros with an unmatched solution to get the job done efficiently. It has a rating of 1,650 In-Lbs. of torque and up to 3,200 bpm. The HDS 183 1/2" Hammer Drill/Driver features Kickback Control, which reduces the risk of sudden tool reactions in binding conditions. This integrated acceleration sensor automatically shuts the tool down when a potentially dangerous rotational torque reaction occurs in a bind up scenario. The hammer drill/driver is engineered with an upgraded, heavy duty all metal chuck and an efficient EC Brushless motor. One of Bosch's Compact Tough™ tools, it delivers 531 in-Lbs. of torque, two drilling speeds, an impact rate of 28,500 bpm for masonry applications and 20+1 clutch settings for reduced fastener damage. This kit includes two 18V 4. Ah FatPack batteries and an 18V fast charger, plus two longer belt clips that will deliver a more secure hold.