... over 50,000 open-close - Passed 48 hours salt spray test Product details: Type:Furniture hinge, Hydraulic hingeMaterial:SteelFinishing:NickleStyle ... .Widening manganese steel spring,can disperse force when the hinge closed. Strengthened spring, thickness 2.5mm instead of ... life time,smaller volumeFull overlay, Half overlay, Insert hinge available:Guide: Accessories: 26mm cup mini concealed door hinge