PRODUCT INTRODUCTION:1 Pair heavy duty furniture spring hinge including left and right spring hinges,with an opening angle of approximately 80 ° GOOD QUALITY:Foldable sofa bed cabinet spring hinge is made from steel structure, coated with black zinc,and it has been well tested by the manufacturer,has good wear resistance,antirust,long service life, can save you time and money WIDE APPLICABILITY: Widely used in folding beds, folding sofas,cabinet doors with lifting doors,bench seat with storage,trap door,toy box,kitchen wall cupboard door,corner cabinet lifters storage support,etc NOTE: Due to differences in material weight and thickness of the installation board, screws need to be prepared by oneself during the installation process. This kit does not include installation screws FUNCTION: The use of this spring hinge allows for easy opening and closing, making it more effortless and providing cushioning when closing 1 Pair top lift hardware support hinge WIDE APPLICABILITY: Widely used in sofa headrests, bedside tables,lockers,cabinets,furniture foldable sofa bed,etc