... , small over lay Material :steel Finish: NP, AB,AC Hydraulic hingeName: hydraulic hinge Type: half over lay, full over lay, small over ... : NP, AB,ACNickel Plated :NPAntique Brass: ABAntique Copper: AC 1. hydraulic hinge have passed 48hours salt spray test2. passed 50,000 ... open and closing test3. untaken apart design hydraulic hinge H series Every series have full-overlay, half overlay ...