Key benefits Keyless security for everyday use: Quick release lock system with a 4digit adjustable code access eliminates the need for keys, speeding the locking and unlocking process while reducing key loss risk. Strong, tamperresistant protection: Tamperproof locking with anticut mechanism and a drillresistant alloy core provides a reinforced and dependable defense against theft. Durable and weatherready: Wearproof material, scratchresistant finish, nonfading surfaces, and a robust paint protection layer keep the lock looking and performing well through extended outdoor exposure. Flexible, multibike and accessory solution: A flexible and adjustable chain mechanism secures several bikes and is suitable for helmet storage. What makes it stand out Robust construction combines keyless convenience with a reinforced core for reliable theft protection. Built to endure daily use and outdoor conditions without compromising appearance or performance. Versatile design supports multibike needs and practical helmet storage in shared or varied lock scenarios. Specifications and features to note 4digit adjustable code access provides a keyless security option. Tamperproof lock with anticut mechanism and drillresistant alloy for a reinforced lock core. Wearproof material with scratchresistant finish, nonfading surfaces, and paint protection layer. Flexible, adjustable chain mechanism designed for securing multiple bikes and accessories. Use scenarios Urban commuting and campus bike racks: Secure one or more bicycles quickly at work, school, or transit stations without carrying keys; convenient for families with multiple riders. Bike sharing or multibike households: Lock several bicycles in a shared storage area or courtyard; switch access using a single 4digit code for all family members, while maintaining security. Outdoor storage and helmet organization: Use the flexible chain to secure bikes and store helmets or related gear in a single, organized solution; suitable for various outdoor environments.