Frassie 28 Inch Nylon Gaming Office Chair Base Replacement Swivel Set, 5 Casters Product Features [Durable nylon base] The base is made of high-quality nylon, which is stronger and more stable than metal and plastic. Load-bearing capacity up to 500lbs. Durable nylon material provides a strong chair base [Heavy duty Bottom plate] Gaming office chair tilt mechanism mounting hole spacing: 10" * 6". Turn the handwheel to tighten or loosen the rear tilt tension. [4.9" stroke cylinder] The gas lift cylinder (Class 3) length is 278mm and the extension length is 403mm. Stroke 125mm (4.9inch). [Smooth and quiet rolling casters] This office caster has precision ball bearings to provide smooth and quiet movement, and the steel structure is durable. Universal size: 1122mm. [Warranty] If there is any problem with the computer chair base, please contact us in time. We will provide free replacement or full refund. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!