Febi Bilstein Wheel Nut. This product is designed to be used as originally intended and not modified for purpose. Please ensure the products are installed by a competent individual. N.B. products are usually supplied without fitting instructions. Quantity: 1 Unit. Material: Steel. Outer diameter: 25.5 mm. Thickness: 20 mm. Spanner Size: 19. Surface: Phosphatized. Bolt Head/Nut Design: Male Hex. Quality/ Grade: 8. DIN / ISO: 74361. Wheel Fastening: Ball seat A/G. Internal Thread Size: M14 x 1,5. Type: Wheel Nut.