This tool is intended for loosening and tightening the nut of the auxiliary steering box on the Citroën DS from model year 1965. It is matched to the specific dimensions of this steering unit type [PW 1]. The shape provides a stable fit on the nut, allowing force to be applied in a controlled way. The tool supports service work on the steering box, such as removal, adjustment and installation. Use reduces damage to the nut and surrounding parts. The tool is suitable for workshop use and can be combined with common hand tools.