Packaging includes: You will receive a set of 8 brass barrel hinges, including 2 pcs M8 brass barrel hinges, 2 pcs M10 brass barrel hinges, 2 pcs M12 brass barrel hinges, and 2 pcs M14 brass barrel hinges Material: Made from solid brass with brass connectors, rust-resistant and corrosion-resistant, ensuring a long service life. Features a roller track design for smooth, silent opening and closing; built-in screws can be used for securing or adjusting installation tightness Overall Dimension (folded): (Height) x (Base Dia) 18 mm / 0.71" x 8 mm / 0.31" ; 22mm / 0.87" x 11mm / 0.43"; 27 mm / 1.06" x 12 mm / 0.47"; 31 mm / 1.22" x 14 mm / 0.55". opening gap of two unfolded hinges: 4 mm / 0.16", 6 mm / 0.24", 7.5 mm / 0.29", 8 mm / 0.31" 180 Degree Opening Angle: Allow you to open or close box at 0-180 degree you desired; hidden hinges make them completely invisible from both sides Application: Barrel hinges are suitable for jewelry box hardware, folding table, cabinet door, handicrafts, wine box, small furniture or using on other wood, plastic, thick glass material; Not recommended for heavy duty projects load-bearing Color: Gold Material: Brass Package Contents: 8Pcs Brass Barrel Hinges Hidden 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.