Material: Made of high-quality stainless steel for maximum corrosion resistance and durability. And the brushed surface does not rust, and the high-strength shaft can be used for a long time, opening/closing more than a thousand times. Convenience: With a unique ball bearing design, these 360 degree swing door hinges provide a simple and efficient way to turn your door easily and quietly. Invisible: Uplink and downlink capabilities make installation quick and easy. It is virtually invisible after installation and does not affect your original door style. WIDE APPLICATION: Concealed revolving door hinge is perfect for swing doors, wooden doors, kitchen cabinets, closet doors, casement windows and more. Perfect replacement for old or damaged door hinges. Dimensions: Overall Dimensions: 95mm x 23mm / 3.86" x 0.90", Shaft Diameter: 18mm / 0.7", Mounting Hole Size: 5mm / 0.2". Base Thickness: 3mm/0.12in. Suitable for door weight: 30-60kg/66-132lbs. Material: stainless steel Color: Silver The package includes: 4 Pivot Door Swing Hinge