Lightweight chain adjuster adds minimal weight to your bike, preserving performance while enabling quick onbike chain tension adjustments for smoother shifting. Combination cable bike lock provides a secure locking solution for your bicycle, helping protect your ride during brief stops. Suitable for 612 speed chains, ensuring compatibility with most bicycle models and drivetrain configurations. Made from metal for long term performance and reliability, built to withstand regular use. Use scenarios Daily city commuting: Park your bike at work, school, or shops and use the combination lock to secure it during short errands. The lightweight adjuster helps maintain proper chain tension with frequent gear changes, supporting reliable shifting without adding noticeable weight. Weekend rides and tours: On longer rides, use the lock to secure the bike during rests and cafe stops. The metal construction offers durable security, while the chain adjuster aids in keeping the chain aligned and tensioned as you ride. Bike storage and shared facilities: When leaving your bike in dorms, gyms, or apartment complexes, rely on the combination lock for straightforward security. The lightweight adjuster contributes to easy handling and transport without compromising performance.