Experience the power with Craftsman portable power tools. These Craftsman 4 V lithium-ion cordless 1/4 in. screwdrivers have the power and features to get the job done! The 4.0 V lithium battery pack provides power and a longer run time, and if the battery is not sufficiently charged, an automatic spindle lock automatically locks the collet to allow for manual tightening. These cordless screwdrivers feature a 2-speed gear box and a 1/4 in. quick-release hex collect chuck that accepts standard nut/screwdriver bits. They're designed with an integrated LED work light to provide direct light to the work area for a better view, and the adjustable torque clutch allows for the proper selection of driving torque to get the job done quickly and easily!