The safety screwdriver - perfect for the motor mount screw (see photo).  Specially wrapped in the manufacturing process with an electrically safe rubber coating.  This also helps to protect the finish of the machine harp as it rests against when you reach back to adjust the height of the motor by loosening and tightening the motor mount screw.  This screwdriver has a laser engraved tip for an easier grip of the head of the screw.  It also works exceptionally for the bed extension and bobbin winder screws.