Specification: Top Length: 13", bottom length: 14.1", the height when use: 6.1"Great Material: Made by high quality heavy duty steel These hinges have 2 positions functions: Couch and Bed Suitable for Sofa bed or you can DIY for your own furnitureNew Design: The difference between these hinges and the Standard Hinges is that they operate from the front When you lift the seat the hinges click and then release. When the frame is in a bed, you lift the seat and it clicks once and locks, and then you tip the seat down, and the back comes up at the same time and makes a lounge positionEasy To Use: If from the bed, you lift the seat until it clicks twice, when you tip it forward, it is in the sofa position Perfect for woodworker to make their own furniture With these adjustable hinges you can converse your sofa to bedPackage Included: 1 pair of Adjustable Spring Mechanism Futon Hinge ( L R)Features:This DIY adjustable spring mechanism futon hinge hardware is suitable for Sofa bed or you can DIY for your own funiture. Also is erfect for woodworker to make their own furniture.If from the bed, you lift the seat until it clicks twice, when you tip it forward, it is in the sofa position Perfect for woodworker to make their own furniture With these adjustable hinges you can converse your sofa to bed.Specification:Color : BlackTop Length: 13"Bottom length: 14.1"The height when use: 6.1"Thickness: 3mmPackage Included: 1 Pair of Adjustable Sofa Bed Hinges (LR)When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don& 39;t hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it "