The S23 PRO Slip-Clutch Screwdrivers provide an implied pulsating force, or slip, once you reach the desired torque. They are suitable for soft joints or for use with sheet metal screws, wood screws or self-tapping screws where the torque level may peak temporarily during rundown. Well-balanced for good ergonomics, PRO screwdrivers take productivity to a whole new level. It features trigger and push to start for pistol grips, and lever and push start for straight models.