Gas spring locks in any position and releases with a simple push of a button or pull of a lever. The semirigid locking gas spring is semirigid-locking in the pull direction and the push-in direction. The spring locking gas spring is ideal for applications where a semirigid stop would damage the application or if there is limited space and rigid locking is not necessary. This listing is for each. Rod Dia. : 0.39 Rod Thread Size : MF10 Force : 250 lb. Adjustable Resistance : No Stroke : 20.08 Compressed Length : 24.21 Fixed Resistance : Yes Locking : Yes Extended Length : 44.29 Fitting Type : Elbow 1-Side Item : Gas Spring Type : Spring Locking Fitting Thread Size : M71 Material : Steel Cylinder Dia. : 0.87 Country of Origin (subject to change) : Germany