Folding hinge Zinc Alloy double cups up down 180 degree cabinet door pirated Concealed flat hinge Adjustable furnishings Hardware Features: 100% Brand new & High quality Applicable to all types of flat beneath doors, bookcases, writing desks, etc. Arm type: slide-in Base: detachable Door opening angle: 90° Installation method: complete disguise Material: zinc alloy Closing method: a bit of force hinge packinginclude: 1pcs X Hidden hinge(with screw)