Is the seat of your office chair or computer chair no longer staying at the height that you want? Does it keep dropping too low? Or do you simply want to replace the gas lift of your chair with a STRONGER or LONGER one? The good news is that you do not have to replace the entire chair if the gas lift has failed or if it is not suitable... just replace the gas lift for a fraction of the cost!Lifts are locking gas springs designed for variable seat height adjustment of swivel chairs, task chairs, executive chairs, operator chairs, computer chairs, and swivel stools. The gas spring is a double cylinder system that consists of a pressure tube and a guiding tube. The tubes provide a smooth seat-height adjustment, they gently absorb the weight of the sitter, and they allow bending movements (for example when the load on the seat is not centred). The overall result is that you can work more comfortably.This black straight gas lift has these important measurements:* Length of outer cylinder (body) = 380mm* Diameter of outer cylinder = 50mm, * Diameter of inner cylinder = 28mm, * User weight capacity = 25 Stone (158kg).