Features: Upgrade your woodworking projects with these heavy duty stainless steel pin hinges, featuring double bearing design for 360 quiet rotation and a remarkable 580lb load capacity – ideal for seamless integration in hidden door bookshelves and Murphy door systems. Engineered with adjustable concealed pivots and erosion resistant black coating, this hidden door hardware set includes accuracy cut paper templates and step by step video instructions for effortless center/offset center installation in bookshelf doors or French styles storage solution. Perfect for enthusiasts, carpenter, and homeowners seeking strong , space saving mechanisms to create discreet room partitions, secret passageways, or functional cabinet door systems. Effortlessly transform living spaces with quiet operating concealed hinges designed for Murphy bed doors, rotating bookshelf entrances, hidden accesses, or customized storage integrated wall units. Professional hidden door hinges combine industrial strength stainless steel construction with quiet performances, ensuring years of stable operate in residential renovations or commercial space optimization projects. Specifications: Component : stainless steel Size: mixed Package Includes: 1 set Concealed pin Hinge note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.