Stability: The rotating swivel plate has a ball bearing raceway, enough beads inside the square top and bottom plate allow the balls to move efficiently and smoothly. Swivel Plate: This swivel plate is made of iron, corrosion-resistant, rust-proof and durable. Size: Approx. 72 x 72mm. Thickness about 0.8mm. satisfy the weight bearing function, reduce the possibility of too much friction, harmless to the table. The rotating bearing is a good tool for furniture assembly and handwork. For use with revolving shelves in corner cabinets, magazine racks, movie posters, turntables.