Thickened steel structure design, using multiple thickened rivets, and upgraded thickened base to improve the durability and sturdiness of the hinge. High-quality hydraulic hinges for 16-40mm thick doors; adjustable screw can adjust hinge between 130-175 degrees. The hinge is easy to install and only requires a screwdriver. These hidden hinges are universal and can be fully covered / partially covered / embedded for installation. These soft close cabinet hinges are made with built-in dampers that help doors close more safely and quietly, and smooth self-closing to protect hands and fingers. Suitable for american style cabinets, european style frameless cabinets, cabinets, shoe cabinets, bookcases, wine cabinets, , cabinets, drawers, but frameless doors only - not for recessed doors. 2 Pack hidden cabinet hinges and screws. Please check the product size carefully before buying.If you are not satisfied with our products, please feel free to contact us.