a, high polished hinge b, enough weight hinge c, fluent and smoothly Products applicationAll kinds of windows and doorsMaterial:Aluminum alloy or Zinc alloy or UpvcLoading capacity:15-30 kilosTesting:Could pass 30000 times opening and closing testFinish:Powder coating, painting, anodizing or as per requestColor:RAL9016,9010,9005,8019,8014,1015...or as per requestPackage:Standard export package or ...