The Bosch CLPK22-120 12V Max 2-Tool Combo Kit (PS31 and PS41) uses the industry's most advanced lithium-ion technology for greater battery life and more run time, all in a lighter package. The lightweight design of the PS31-2A is ideal for easy handling in overhead operations and tight spaces, and the Bosch 12 Volt Max drill/driver lets you tackle professional jobs with ease. The Bosch PS41 12 Volt Max impact driver offers the precision of variable speed, a light body, and a short head length. PS31 has 1300 RPM and 265 in. lbs of torque. PS41 has 2600 RPM, 3100 BPM, and 930 in. lbs of torque.