Description: 【Adjustable Tilt Mechanism】: This chair base features an iron swivel seat control mechanism, allowing for easy tilt adjustments. It's a heavy-duty lift mechanism designed to enhance the functionality of your office or gaming chair   【Office Chair Accessory】: With its standard size, this rotating base is compatible with most office stools and computer chairs, making it a versatile replacement part for various seating solutions   【Easy Installation】: Engineered for convenience, this chair swivel base is straightforward to install and offers a practical solution to meet your seating needs effectively   【Simple Yet Functional】: The design of the chair's tilt control mechanism is minimalistic yet highly functional, providing you with an ideal user experience by enhancing comfort and usability   【Sturdy Construction】: Made from sturdy iron material, this chair swivel base ensures stability and reliability during use, catering to diverse requirements while maintaining reliability Specification: Material: Iron Size Chart: Small: LxW: 21cmx13cm/8.27inchx5.12inch or Medium: LxW: 22cmx15cm/8.66inchx5.91inch (optional) or Large: LxW: 25.5cmx15cm/10.04inchx5.91inch (optional) Package Includes: 1 Chair Tilt Control Mechanism Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.