two bar hinges , friction hinges . Suitable for PVC/Aluminum windows and doors . To limit the opening angle of windows Wind Supporter, two-bar friction stay, ... window hinge, door hinge, aluminum alloy hinge, zinc alloy hinge for UPVC/Aluminum windows and doors. Features: Durable , applied and ... , gasket seal, fasten bolts, pneumatic tools and so on. two bar friction , friction hinges , two bar hings