Made of heavy pressed steel, with heavy fork and top plate fitting, very strong bolted and secured central kingpin, double ball bearing in the swivel head, additionally reinforced by the integration of four specially shaped and hardened bearing seats resulting in a very high resistance to shock and impact loads. Steel truck lock. Height adjustment with flat spanner. Bolted wheel axle. Zinc-plated, blue-passivated, Cr6-free. Made of high-quality, impact-resistant nylon.