Waterproof bicycle chain lock built from carbon steel for strength, durability, and long service life. The chain lock is designed to endure regular use and resist wear in various weather conditions. Key benefits - Waterproof and wear-resistant construction to protect against rust and abrasion - Durable carbon steel chain designed for long-lasting security - Locking options: can be secured without a key for quick securing, and also provided with keys for easy locking and unlocking - Portable and convenient to carry for everyday use - Multifunctional and versatile: suitable for bicycles, electric vehicles, motorcycles, and other similar applications What this product offers - Material and performance: carbon steel chain, built to withstand routine bike security needs; designed to be weather resistant for outdoor use - Function and compatibility: works as a general chain lock for protecting various vehicles including bicycles, electric bikes, and motorcycles - Size and portability: compact enough to transport as part of everyday bike gear - Reliability: provides a straightforward locking and unlocking experience with both keyless and keyed options Use scenarios - Quick stop at a shop or park your bike at a rack while running errands, using the keyless locking option for fast securing - Park your electric bike or scooter at campus, workplace, or public areas; secure with the chain lock to deter theft during short breaks - Lock a motorcycle or larger vehicle when leaving it unattended for a period, benefiting from the durable carbon steel chain and reliable locking mechanism