Features 1、The whole hinge structure is stable, durable but not loose. 2、Middle of the hinge is a cold rolled steel block with stable structure and smooth switch. 3、Thickened and stiffened hinge greatly improved durability. 4、Internal roller track design, smooth and mute when use. 5、180 Degrees opening angle that two plates can be overlapped. Specification Features: The whole hinge structure is stable, durable but not loose. Middle of the hinge is a cold rolled steel block with stable structure and smooth switch. Thickened and stiffened hinge greatly improved durability. Internal roller track design, smooth and mute when use. 180 Degrees opening angle that two plates can be overlapped. Suitable for folding doors, folding tables and other furniture. Specification: Color: Silver Material: Zinc alloy, CRS(Cold Rolled Steel) Size option: XS, S, M, L Bearing: 6KG, 9KG, 10KG, 20KG (According to the different sizes) Weight: approx. 31‑137g Package List: 1 x Hinge Package List