The Bosch line of cordless tools uses the industry’s most advanced Lithium-Ion technology. This gives the battery 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. 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.BOSCH POWER TOOLS – Features and BenefitsPS41 impact driver has the shortest head lengthPS41 impact driver features high torque in a pocket size body