4 sets of swivel hinges for attic ladder, invisible swivel hinges for toolbox cabinet

Connects the top and bottom axes, rotates 360 degrees, convenient and reliable. Fits all door styles and can be installed in bedrooms, kitchens, and basements. Creates a clean and elegant look. Can be used for hidden doors, rotating screens, hidden locker doors, cabinet doors, etc. Made of copper, sturdy and durable. Solid steel ball reduces friction and produces less noise. Made with good craftsmanship, the structure is solid, so you can use it with confidence.