Sturdy and durable, the folding bike lock is made of high-strength aluminum alloy, resistant to cutting and shearing, with high torsion and tensile strength. The 26-joint foldable design allows 360-degree rotation, making it easy to fold and convenient to install and carry. Folded dimensions: 7.4 x 7.4 x 5.3 cm. Expanded length: 85 cm. Includes 3 keys for added convenienceuse one for daily access and keep the others as backups in case a key is lost. The key cannot be removed when the lock is engaged, helping prevent loss. The chain features a protective layer made of waterproof and dustproof ABS rubber coating, which helps protect against rust, oxidation, and corrosion. This extends the life of the lock and helps prevent damage to the bicycle frame. Suitable for bicycles, skateboards, motorcycles, fences, and other applications. Specifications: Material: Aluminum alloy Folded size: 7.4 x 7.4 x 5.3 cm Open lock length: approximately 85 cm Weight: 730 g