Material :Chrome vanadium steel, through hardened (toughened), surface chrome-plated.

Version :The spring-loaded retainer ball, made of high quality steel, retains screws very securely in all positions even when the screw is at an angle. This retention function makes the screwdriver the ideal tool, particularly when screws have to be inserted and tightened horizontally, at an upward or downward angle or into deep blind holes.