DIY Supplies: WoodworkingName: Small dual-purpose hingeMaterial: metalColor: BlackMaterial thickness: 2.3mmSurface: electroplating zincSize: 230*70 mmFunctions: for the sofa back and sitting back of the connection, adjustable the height of sofa back.Suitable for connecting armrest and seat, backrest and seat, pillow and backrest, armrest and backrest.bed frame and bed.Through the gear operation, change the handrail, side, pillow, seat and bed between the angle adjustment.Easy Installation, the use of gear opening and closing position card design, multi-angle, multi-range.Metal Steel Black Sofa Bed Bedding Furniture Adjustable 3-Position Angle Mechanism Hinge Hardware.Package Contents:1 * Pair hinge (Screws are not included)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.