High quality:This product is made of high quality metal. It is made of high quality material, which is strong and durable and has a long service life. High load-bearing capacity and durability Features:This product has a large load-bearing capacity and high durability. It is installed on massage beds, beauty beds and other furniture headrests by gear operation to change the angle between armrests, edges, pillows, seats and bed surfaces. Wide range of applications: The product has a wide range of applications for medical beds, massage beds, double bed backrest adjustment, school drafting tables, multimedia desks and other desktop angle adjustment. Adjustable:This product is adjustable. It has 18 gears adjustable. Package:1 * Adjustable hinge Item size: 23.5 * 10 * 2cm / 9.24 * 3.93 * 0.79inch , net weight: 500g / 17.64oz, Manufacturer: Shun Yingtong