SOSS Mortise Mount Invisible Barrel Hinge, Solid Brass, Satin Brass Finish, 14mm Diameter, 3/4" Door Thickness, 15.5mm Mortise Depth (Pack of 24) Invisible barrel hinges are made of solid brass with brass links Barrel hinges are totally invisible from either side when the door is closed They are easily installed Not recommended for vertical or load bearing application 14mm barrel diameter