1. Size Package: The package comes with 2 pieces 160 x 160 mm / 6.3 x 6.3 inch bar stool swivel plate in 25 mm / 0.98 inch height, 20 x 6 mm / 0.79 x 0.24 Inch (L x W) in slotted mounting holes. The mounting holes are properly aligned and installation takes a few minutes. Don't tighten down the screws until all of them are 2. Material: The square seat swivel base is made of metal with a smooth surface, good stability and impact resistance, good loadbearing capacity, not easy to rust or deform, and can be used for a long time 3. 360Degree Rotation Smoothly: The lazy Susan turntable plate features ball bearings and fullcircle track design, which ensures uniform force in allround circular motion, and achieves 360degree smooth, silent rotation, improving operation stability and flexibility while creating a quieter use environment for you 4. Easy to Use: The seat swivel base mount plate is easy to use and can directly the old or worn bar stool swivel plate to restore it to smooth rotation. It is suitable for repairing or modifying unstable chairs. After installation, it can effectively avoid noise or friction sounds