Material: The hinge support frame is made of zinc alloy and iron. It is durable and sturdy, won't fade, rust, or corrode easily, and is a great accessory for your door. Note: The gap between the window sash and the window frame should be 18-20mm. Suitable for plastic-steel doors and windows. Use: Suitable for inward- and outward-opening doors and fits left- and right-handed doors or windows. Easy Installation: We provide the necessary pins, and you can easily install the hinge. Simply follow the instructions in the picture. Package Contents: You will receive 1 hinge and 7 screws in the package, suitable for your installation needs.