welcome to our website. Product use: single telescopic column of hydraulic support is a part with joins the beam and base, bearing the load of crown plate.It is the main load bearing part ,including two forms; all-hydraulic and mechanically lengthening. Contact us if you need more details on Shandong Rizhao. We are ready to answer your questions on packaging, logistics, certification or any other aspects about Micro Hydraulic Cylinder、Double Acting Hydraulic Cylinder. If these products fail to match your need, please contact us and we would like to provide relevant information.