Check the listing for details. 50Pack Invisible Barrel Hinges 4mm x 15mm Brass Concealed Hinge Black. Color: Gold, Condition: New. Listed at 16.12 USD. SpecificationSize: 4x15mm/ 0.15x0.6 inchColor:BlackMaterial:BrassPackage: 50x Concealed Barrel HingeDescription:Invisible Design: These barrel hinges are concealed within the door or box, providing a seamless and hidden look. Provides smooth and seamless movement for opening and closing doors or boxes.Brass Material: Made of solid brass, these hinges are durable and resistant to corrosion. These invisible brass barrel hinges will keep your items looking new.Easy to Install: These hinges are easy to install and can be hidden by simply drilling holes in the wood. Suitable for hidden or secret compartments where traditional hinges would be visible.Application: Install these hinges on jewelry boxes, pencil boxes, cabinet doors, small woodworking projects, or any other small item that requires a concealed hinge.