@ke.di.material: Our adjustable sofa headrest hinges upgrade your sofa's comfort! Freely adjust the height and angle of the headrest and armrests. 1- Thickened metal material for stability and durability. 2- Smooth adjustment with multiple settings to meet individual comfort needs. 3- Easy installation and widely applicable to sofas, recliners, and other types of furniture.#SofaBedMechanism #Furniture #StorageSofa #Upholstery #FurnitureLiftHinge