electric screwdriver - a manual power tool or pneumatic tool with adjustable torque and / or screw depth, designed to tighten and unscrew screws, screws, dowels and other types of fasteners, as well as drill holes (if there is a cam chuck or when using hexagonal drills shank). An electric screwdriver works from a battery or from an external current source (mains, generator), a pneumatic screwdriver - from a compressor or reservoir with compressed gas (usually air).