Strong Construction: Made from sturdy stainless steel, these hinges resist rust and wear, ensuring consistent function for both indoor and outdoor applications with long lasting Complete Set: Contains upper hinge, lower hinge, door fastener, hinge screws, fastener screws, a two tip driver tool, and gloves, providing all parts needed for effortless setup Easy Installation: The set includes screws, a driver tool, and protective gloves for simple assembly, minimizing effort while achieving secure and visually appealing results Complete Rotation: Featuring top and bottom linkage design, the hinges allow full turning when center mounted and partial turning when side mounted, meeting various styles and needs Wide Applications: These concealed door hinges are designed for wood and aluminum frame doors, perfect for hidden doors, secret bookshelf doors, and heavy duty uses, providing adaptable choices for different environments, Manufacturer: Kaeltsyn