HAMILTONA Endurance SeriesA casters represent the aoebest of breeda in kingpinless-style design. The top plate and inner raceway are formed from one piece, providing a superior raceway for shock conditions. Once formed, the raceways are CNC-machined and then induction hardened to ensure a uniform depth in hardness of the swivel raceway. A sealing cap is welded to the outer race to assure protection from foreign material and to keep grease in the raceway. Finished in bright zinc plating. Legs welded inside and outside to forged steel horn base.