Screw driver including a holding device

A screw driver for use with electrical appliances under voltage includes a handle and a functional part with a shank and an end piece. The shank is designed to be partly covered by an insulating sleeve made of plastic. The end piece is insulated and connectable to said handle so that torque is transferable from said handle to said functional part. The handle is insulated from said shank. Furthermore the screw driver includes a holding device which is connected to the handle and comprises a secured position and a released position. The holding device is manually operable between the secured position and the released position. In the secured position the holding device positively engages the functional part such that the functional part cannot be detached from the handle. In the released position the functional part is allowed to be detached from said handle.