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NOTE: NOT FIT 40mm Diameter Base Hole. NOT FIT 40mm Diameter Base Hole. Size:6"_Stroke(Sink_1.2") Product Description Size: 6" (150mm) marked as 6.3" (160mm) Adjustment Height (Piston Travel): 6" (150mm) Cylinder Overall Length: 12.4"-18.3" (315-465mm), Smaller tube Length: 2.8" (70mm), Bigger tube Length: 9.6" (245mm) Diameter of the outside metal tube is 1.57" / 40mm for bottom, 2" /50mm for above body. Diameter of the smaller metal tube is 1.1" / 28mm. Diameter of the plastic button is around 10mm. Features: - Adjust height of office chairs - Class 4 level, Top Quality Level, Heavy Duty Construction, Specialized for Heavy Person,BIFMA Plus Quality - Allows full 360 degree rotation Gas cylinder may possible break the package when the button is pressed and triggered during the shippment. If received Empty Package or not perfect gas cylinder, please contact seller for free replacement, instead of leave negative review directly.