The Bosch CLPK238-181 18V 2.0 Ah Cordless Lithium-Ion EC Brushless Impact Driver and Drill Driver Combo Kit offers two complementary cordless tools and a cordless, versatile power kit in one convenient package. This kit provides the IDH182 18V Brushless 1/4 - 1/2 in. Socket-Ready Impact Driver and the DDS183 18V Brushless Compact Tough 1/2 in. Drill Driver. The IDH182 Impact Driver is able to switch from 1/4 in. screwdriver bits to 1/2 in. sockets, for an all-in-one impactor with plenty of driving power. It provides contractors, carpenters and other pros with an unmatched solution to get the job done efficiently. The DDS183 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 drill is engineered with an upgraded, heavy-duty all-metal chuck and an efficient EC Brushless motor.