Superior Durability: Made of high-quality zinc alloy material, these concealed door hinges are sturdy in structure and have strong load-bearing capacity; The ultra-quiet roller moving track opens and closes smoothly without any annoying noise. Hidden hinges are ideal for both residential and commercial applications, providing long-lasting performance3-Way Adjustable: Hidden door hinges heavy duty are easy to install and free adjustment in 3 ways, we attach detailed installation instructions to solve the installation and use problems for all customers. Our concealed hinges black matte have three-dimensional adjustability, 2.0mm horizontally, 3.0mm vertically and 1.0mm in depthAfter-sales Service: We stand behind our products! If you have any questions about our hidden door hardware, please feel free to contact us! We will serve for you wholeheartedly.Wide Application: The heavy duty door hinges black matte suitable for suitable for any occasion wooden doors, swing doors, aluminum alloy doors, smoke-proof doors, soundproof doors, etc. Such as bedroom, kitchen, living room, cabinets, wardrobes, study doors, farm doors, classroom, hotel, office, log cabin, store, dormitory, etc. These invisible hinges are ideal for both residential and commercial use, offering flexibility and reliabilityEasy to Install: Our invisible door hinges come packaged with the screws and installation instructions needed for installation, making them easy to install and adjust. The concealed mechanism ensures a seamless fit, while the adjustable screws allow for precise alignment of the door, making them ideal for new installations or replacementsHidden Door Hinge Design: Our hidden door hinges for secret door offer a clean, minimalist look by concealing the hinge within the door frame, enhancing the overall aesthetic of any interior. 180 maximum angle opening and closing, adapt to more use needs