Hinge material: plastic + iron + copper. The tree is made of high-quality materials, with high strength, durability and practicality. One pack contains 4 cabinet hinges. Please refer to the length/width of the cabinet door on the chart before purchasing. Product Details: Cylinder block and connecting rod: with stronger load and flexible switch. Wear-resistant ABS has an easy-to-open circlip device, which is more durable. Stable installation: easy to install, circular metal mounting plate: the contact area of the cabinet is larger and the three-point position makes the installation firmer. Scope of application: hydraulic assistance, automatic expansion. Suitable for drawers, kitchen cabinet doors, wardrobes, etc., most suitable for cabinets. Reminder: It can be used for objects up to 6kg. To support a door, the supporting weight can only be 4-6 kg. If you don't know how to choose, please contact us directly and we will provide you with a suitable "N" number. Welcome to meet