Features 1、Good Tightness: The gas spring has thickened double layer sealing rings, accurate hydraulic oil sealing without leakage. 2、Made of Spring Steel: Using excellent spring steel material, with thickened seamless cylinder, not easy to rust and deform. 3、With Low Friction: These gas springs have good surface finish and low friction, and are not easy to damage parts during use. 4、Standard Size: The hydraulic support rod has a standard size, the center distance is 540mm, and the stroke is 225mm. 5、For Support and Adjustment: Commonly used for support, braking and adjustment of beds, cabin doors, mechanical equipment, etc. Specification Item Type: Gas Spring Material: Spring steel Center Distance: Approx. 540mm / 21.3in Stroke: Approx. 225mm / 8.9in Bore Diameter: Approx. 22mm / 0.9in Rod Diameter: Approx. 10mm / 0.4in Package List 2 x Gas Spring