Made of heavy pressed steel, with heavy fork and top plate, 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. Bolted wheel axle. Bolted wheel axle. Zinc-plated, blue-passivated, Cr6-free. Made of high-quality, impact-resistant, hard and tough, highly compressed cast nylon with outstanding load capacity, very low rolling and swivelling resistance, smooth running performance on even floors, very high abrasion resistance.