Hongtian is a professional factory that manufactures a complete range of gas spring. Hongtian keeps enhancing ourselves and creating new products to fulfill clients request. From foundation to today, our products have expanded to office chair mechanism series, metal five star chair base series and other metal products. We concerns about quality, all parts are with optimized designed. In order to make sure all finished products are high quality, all incoming material, semi-finished products, finished products are experienced strict inspection before next process. All products must be experienced final inspection before delivery. Our gas springs guaranteed to comply with applicable ANSI-BIFMAX 5.1-2002 & EN1335-3 standards. All our products are able to provide high quality products with most reasonable price to meet clients target. Our products are including: rotating height adjustable