Material: Made of high-quality stainless steel with maximum corrosion resistance and durability. And the brushed surface will not rust, high-strength shaft for long-term use, to be turned on and off more than a thousand times. Practical: With the unique roller ball design, these 360-degree door pivot hinges offer a simple and effective way to swing the door smoothly and quietly. Invisible: The up-and-down connection feature allows for quick and easy installation. Almost invisible after installation, it does not affect the original style of your door. Widely Used: The concealed pivot door hinges are wonderful for swing doors, wooden doors, kitchen cabinets, cupboard doors, casement windows, and much more. Perfect replacement for your old or damaged door hinges.