Package Include: 1 x gas cylinderchair not included. Samhongsa was founded in 1971, is a professional production and sales of Cylinder for office chair. Samhongsa have advanced production equipment and testing equipment and improved management system. Samhongsa always insist on the operation idea of “human-oriented, honesty first, lean management and excellence” Providing perfect quality and service for users and possess the good reputation. Samhongsa’s cylinder have acquired and through eight world standards certificationsSuch as: BIFMA;LGA;TUV;SGS, ect. Samhongsa have built a friendly, long-term with Herman Miller, Allsteel, Steelcase, HON, etc. Listing is for a brand new never used CLASS 4 WITH 400N, office chair seat height adjustment pneumatic gas lift cylinder. 6.0 stroke (seat travel from lowest to highest seatings). Exceeds ANSI/BIFMA5.1-2011 standards, based on the specs of this cylinder, it’s load capacity is 350 pounds. Cylinder Diameter: 28mm (1.1″) Column Diameter: 50mm (approx 2″). Cylinder for Size A, B and C Aeron Chair.