MATERIAL:The is automatic reset hinge is made of iron material,great process has good endurance,not easy to fade,anti-corrosion ,high strength,very beautiful and practical EASY INSTALLATION:The lid hinge is used for side mounting and top mounting.Only mark two points for drilling holes,and screw each mounting accessory into its respective place CUSTOMIZABLE COMFORT:Effortlessly adjust the height of your sofa backrest to your desired position,enhancing the comfort and versatility of your DIY furniture creations LOAD CAPACITY:With our two adjustable angle hinges,enabling you to design and build furniture that meets various weight requirements WIDE APPLICATION:Suitable for woodworker to make their own furniture with these adjustable hinges you can adjust your sofa to simple bed,and can adjust recliner,couch,seat back,storage box lid or tatami`s angle.Or you can DIY for your own furniture, Manufacturer: CYDZSRA