High Security & Keyless Design: Say goodbye to the hassle of carrying keys and hello to keyless convenience. The advanced 5-digit combination bike chain lock offers unparalleled protection, with up to 100,000 possible combinations, making it virtually impossible to crack. This bike lock is the perfect choice for those who value safety and convenience above all else.Rock-solid & Built to Last :bicycle lock is as tough as nails. Crafted from ultra-thick 0.236"/6mm manganese steel, it boasts unparalleled resistance against cutting and sawing. The lock core, made from sturdy zinc alloy, adds an extra layer of protection, thwarting any attempts at malicious cutting and ensuring long-lasting durability.Scratch-Resistant Cover & Dustproof Cap: The flexible high-quality polypropylene fabric cover protects your hands against heat or cold, and prevents chain from rust, and keeps the bike paint from scratches, ensuring the bike lock lasts for years to come. Plus, the dustproof cap is an added bonus, keeping rainwater and sand out of the lock hole.Convenient & Easy to Reset: Setting up and resetting your personalized combination password is a breeze. The initial password is 00000, and when it's time to set a new password, simply keep the number wheels in the correct unlock password state and rotate the reset dial 90 to set the new password. No more worry about forgetting your password or struggling to reset it again.Versatile Applications: With options available in lengths of 3.2ft, you can easily lock two bikes together. Better yet, this bike lock is also suitable for a wide range of applications, including bicycles, electric bikes, ladders, lawnmowers, gates, fences, toolboxes, sports equipment, and more.