MySit 2.2" Stroke Office Chair Gas Lift Cylinder Replacement | 5-Year Warranty Heavy Duty Shortest Gas Spring Rod Chair Part Sinking 1.2 inches Universal Size Black for Short Person Sink1.2 inch 3 cm Fit most of chairs. No worry about the height of the chair foot. Class 4 level, Top Quality Level, Heavy Duty Construction, Specialized for Heavy Person,BIFMA Plus Quality Height Adjustable range: 2.2 inches, outside Cylinder bottom shrinkage make task chair minimum seat height shorter. Outer tube diameter is 2 Inches, fit for 2 Inches Base holes. Please measure your old gas cyclinder size for reference, in case of diameter not fit or too short / too tall/ touch the floor. or contact seller for suggesttion.NOT FIT 40mm Diameter Base Hole. 5 years Warranty - 30 Days Free Replacement or MoneyBack Guarantee