4digit quickrelease combination lock for key access: set and use a 4digit code to unlock quickly without carrying keys. Ideal for everyday convenience while maintaining controlled access to your bike or vehicle. Reinforced, tamperresistant construction: reinforced lock core and a drillresistant alloy housing work with an anticut mechanism to reduce vulnerability to forced entry and tampering. Durable, longlasting finish: nonfading surfaces, scratchresistant coating, wearproof materials, and a protective paint layer help the lock maintain appearance and function through regular use. Flexible, adjustable chain design: the chain adapts to different frame sizes and lock points so you can secure one or several bikes. The flexible layout also enables practical helmet storage and pairs with common lock attachment points. Nokeys, lowmaintenance operation: combination access eliminates lostkey problems and simplifies sharing access among riders without compromising security. Lightweight handling and reliable performance: designed for daily use with focus on consistent operation, resistance to common attack methods, and a secure locking action. Typical use scenarios Commuter parking: quickly secure your bike at a city rack during work or errands using the 4digit code, avoiding keys and minimizing fuss. Multibike storage: bundle multiple bicycles in a garage or shared storage area with the adjustable chain and single combination lock for simplicity and space efficiency. Onbike helmet security: loop the chain through helmets or accessory mounts and lock to the frame, keeping helmets with the bike and reducing theft risk. Materials and features summary Lock type: quickrelease combination (4digit) Core and body: reinforced lock core with drillresistant alloy and anticut mechanism Finish: scratchresistant, nonfading coating with protective paint layer Design: flexible, adjustable chain suitable for multiple bikes and helmet storage This lock combines key convenience with reinforced construction and a wearresistant finish to provide reliable, practical security for everyday bike use.