Slim Design: This door hinge features an ultra-thin profile that requires a minimum depth of 0.5 to 1.27 centimeters, better preserving the door's integrity and longevity. When closed, it disappears perfectly into the door frame, making it ideal for spaces where a clean aesthetic is desired. Aluminum Alloy Material: This invisible hinge is made of a high-quality zinc alloy that offers high hardness and wear resistance for long-lasting use. Two hidden zippers hold loads up to 110 pounds and ensure stability for both doors and furniture. Quiet Operation: This door hinge is equipped with integrated seals that guarantee quiet and easy movement. It allows doors to open and close silently without additional lubricants, offering smooth and comfortable operation to create a peaceful environment. DIY Installation: This door hinge requires a stop and is not a standard size. Comes with screws, manual, and wrench. You can test the hinge stop on a piece of old wood in advance. Door frame hinge: 4.7 × 1.45 × 0.5 inches. Door hinge: 9.6 x 2.5 cm Invisible and Adjustable: Our zinc alloy hinges feature a unique, adjustable design that allows you to adjust the hinges for perfect alignment. Ideal for DIY enthusiasts and interior designers, our hinges are the perfect solution for retractable doors, aluminum-clad wooden doors, and advanced custom projects.