ULTRA STRONG AND HIGH QUALITY - Our bicycle lock is made of high-performance steel that is tough, cut-resistant and shear-resistant and withstands high torsional and tensile strength. The highly secure bike lock gives the security of your bike AMAZING COMFORT AND SECURITY - 2 keys for more comfort The key can only be removed when it is locked, which prevents loss of the key. You can take one of the keys for everyday use and leave another key at home in case you accidentally lose one. PROTECTIVE LAYER COVER - This chain is made of waterproof and dustproof ABS rubber paint, which can effectively protect it from rust, oxidation and corrosion. This significantly extends the life of the lock and prevents it from damaging the bike frame. FLEXIBLE FOLDING DESIGN - With special rivets that make folding easy and flexible, significantly reduce the size of the locker based on the largest locker room and make installation and removal easier. Folding size: 6.6 * 5.5 * 7.5 cm, size: 83 cm, support some bicycles SIMPLE MOUNTING OF THE BRACKET - Thanks to the practical, high-quality bracket, your lock fits you. Our bracket is attached with Velcro for each bicycle tube.