Sytopia 24''(60Cm) Office Chair Base Replacement, Heavy Duty Chair, Matte Black Product Details ??Universal Size?This 24'' office chair replacement base is suitable for most of the market including Herman Miller (office chair, study chair, desk chair, vanity chair). Casters: 7/16 inches x 7/8 inches (11 mm x 22 mm) and gas cylinder 2 inches (5 cm). ??High-quality Craft Materials?Sytopia upgraded office chair base replacement features high-quality chrome construction for enhanced durability. It offers an impressive carrying capacity of 2600 lbs and has ANSI and BIFMA certification. ??Safety and Scratch Prevention?Avoid unstable gravity and floor scratches caused by improper height. Our chair base replacement ensures low gravity, stability, and safety, preventing scratches and saving you the expense of buying a new chair. ??Save on Budget?Save money by opting for a chair base replacement, costing just 1/5 of buying a new chair, as long as your seat is still in good condition. Preserve your favorite chair and stay within your budget. ??Risk-Free Purchase?Each chair base is meticulously crafted for you. If you're not fully satisfied, our friendly Customer Service is ready to assist. Enjoy a 30-day FREE return/exchange service for any issues. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.