This semi-circular hinge set is made of high quality zinc alloy, solid and durable. 90 degree opening angle, recessed when opening, ideal for desktop applications The 90 degree opening and closing mechanism is very convenient to use and can be used with cupboards or flap doors. The opening and closing time is more than 50,000 hours, which is a reliable product One-piece hinge, adjustable fittings, for wooden flaps and lids, up to 10 kg Wood Folding Round Hinges, Hidden Double Cup Hinges, Fully Open Hinged Cabinet Doors, Lift Hinges, Flap Hinges Folding hinges are suitable for small furniture such as kitchens, bedrooms, wardrobes, cupboards, etc. Package contents: 2 hidden hinges.