1、There are C shape notch on the upper and U shape notch on the bottom with M8 screw holes, which is easy to install. 2、There is an inflation port on the side of the gas spring cylinder, which can be used for pipe connection system. 3、The initial spring pressure of 2400 series nitrogen gas spring is 24000N, which is small in size and long in working stroke. 4、The piston rod has high hardness after special processing of fine processing, and the roughness reaches about Ra0.02um. 5、The cylinder diameter of the nitrogen gas spring is 72mm, and the plunger diameter is 45mm, which makes the installation and use more precise. 1 x Nitrogen Gas Spring Item Type: Nitrogen Gas SpringMaterial: AlloyPurpose: Die compression nitrogen cylinderCylinder Diameter: Approx. 75.2mm / 3inPlunger Diameter: Approx. 45mm / 1.8in