[HIGH ANTI-THEFT]: It's hard to break through as the lock cylinder of the bike lock is made of zinc alloy, chain 7mm diameter, weighs 795g, drill-resistant and anti-tech unlocking. [2 KEYS AVAILABLE]: It comes with 2 keys, keep a spare key to avoid losing the key and not being able to unlock the door. [WATERPROOF]: The lock cylinder has a waterproof and dustproof cover to prevent dust from entering the lock hole and blocking it, protecting the lock cylinder from rusting and extending its service life. [NYLON COVER PROTECTION]: The bicycle chain lock made of nylon cloth cover, scratch-proof and wear-resistant, anti-hot and anti-icing hands; it protects the chain and prevents it scratching your bicycle frame, long lifespan. [WIDE RANGE OF USE]: Our chain lock has a length of 120cm and can be widely used for bicycles, motorbikes, E-Bike, scooters, but also for ladders, gates, fences, toolboxes, sports equipment and other important items.