Dimensions & Compatibility: Each hinge measures 22.5 mm in height and 10 mm in base diameter when folded. The opening gap between two unfolded hinges is 5.8 mm.ensure compatibility with your project. Premium Material Construction: Crafted from high-quality polished brass, these hinges are not only aesthetically pleasing with their shiny finish but also boast durability and rust resistance. Their robust construction ensures a strong load-bearing capacity. Functional Design: These hinges feature a 180-degree opening angle, allowing for a wide range of motion from 0 to 180 degrees. The concealed design ensures that the hinges remain invisible from both sides, maintaining the aesthetic integrity of your project. Installation Made Simple: The package includes 40 pieces of 10 mm brass barrel hinges, complete with a roller rail design for a smooth and silent operation. Installation is straightforward-simply drill a hole and insert the hinge. Versatile Applications: Ideal for a variety of projects including jewelry boxes, folding tables, cabinet doors, and other small furniture. These hinges are also suitable for use on wood, plastic, and thick glass materials, though not recommended for heavy-duty applications. Colour:As Shown Material:copper Package Contents: 40 x Barrel hinge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.