Robust and Durable: The foldable bike lock is constructed from super-strong aluminum alloy, offering robustness, resistance to cutting and shearing, and high torsional and tensile strength. Foldable Design: The 26-link foldable lock can rotate 360 degrees, making it easy to fold and convenient for installation and carrying. Folded dimensions: 7.4 x 7.4 x 5.3 cm. Extended size: 85 cm. Includes 3 Keys: Comes with 3 keys for added convenience. Use one for daily use and keep another at home in case you lose one. The key can only be removed when locked to prevent accidental loss. Protective Coating: The chain is coated with waterproof and dustproof ABS rubber paint, effectively protecting it from rust, oxidation, and corrosion. This significantly extends the lock's lifespan and prevents damage to your bike frame. Multifunctional: Perfect for bicycles, skateboards, fences, motorcycles, and skateboards. Foldable bike lock extends the locking area. Folded size: 7.4 x 7.4 x 5.3 cm. Open lock length: approximately 85 cm.