Advanced design concept: Sturdy structural design, brilliant round groove design, support the bearing capacity of various objects and reduce the possibility of too much friction, harmless to the table. Material: This swivel plate is made of Galvanized steel, surface coated with zinc, corrosion resistant and rustproof. Flexible rotation: Our pivot bearing has a deeper ball track to allow the balls to move effectively and smoothly. Stability: The bearing can rotate freely, the double bearing rotates evenly, the flexibility, the pendulum play is relatively small, the production of the connecting edge, the load-bearing capacity. Practical and versatile: ideal for replacing on many stools, bar stools, chairs, boat seats, suitable for use with rotating shelves in corner cabinets, record player kaleidoscopes, table service, magazine racks, movie posters, television and computer monitors."