Made of metal material, sturdy and durable, long service life. It is used to connect the backrest and seat back of the sofa, and the height of the backrest of the sofa can be adjusted. Suitable for connecting armrests and seats, backrests and seats, pillows and backrests, armrests and backrests, It is easy to install, adopts the design of gear opening and closing position card, multi-angle and multi-range. Package content: 1 * folding hinges (excluding other products)., Manufacturer: Shun Yingtong