Size & Package The package includes 2 pieces of 155 x 155 mm (6.1 x 6.1 in) bar stool swivel plates. Height is 8 mm (0.31 in), with 5 mm (0.20 in) slotted mounting holes and a plate hole diameter of 120 mm (4.72 in). Mounting holes are aligned for simple installation and it typically takes just a few minutes. Do not tighten screws until all are in place. Material The square seat swivel base is metal with a smooth surface, offering stable performance and impact resistance. It provides good load-bearing capacity and is designed to resist rust and deformation for long term use. 360-Degree Rotation Smoothly The lazy Susan turntable plate uses ball bearings and a full-circle track to distribute force evenly in all directions, delivering 360-degree smooth, silent rotation. This enhances operation stability and flexibility while creating a quieter usage environment. Easy to Use The seat swivel base plate is easy to install and can directly replace an old or worn bar stool swivel plate to restore smooth rotation. It is suitable for repairing or modifying unstable chairs. After installation, it effectively reduces noise or friction sounds. Use scenarios - Replacing worn swivel plates on home kitchen or bar stools to regain smooth rotation. - Repairing cafe or restaurant stools to restore stable, quiet operation. - Upgrading workshop or office stools by installing on existing bases for improved performance.