Specification: Pressure: 30N(per pillar); Load Bearing: 3-4kg; Extendable length: 0-55mm; Total Length (Approx. ). : 190mm/7.48″. High Quality: The black support hinge is made of high-quality stainless steel and nylon material, with a solid vacuum hydraulic core, which has very high pressure resistance and is not easy to deform.