NDakter Bike Chain Lock, Black, 6 ft Long, 0.16 in Thick, 5-Digit Resettable Combination with Sleeve

Designed for riders who want strong, convenience-first security, this NDakter chain lock combines a drill-resistant lock cylinder, thick alloy chain links and a protective fabric sleeve to reduce frame wear. Available in multiple lengths and thicknesses, it offers flexible use around poles, railings or to lock multiple bikes together. The keyless, 5-digit code gives 10,000 combinations so you can set and change your own password without carrying a key.

How reliable is the NDakter lock against common theft attempts?

The lock pairs a hardened 0.16-inch (4–6 mm options depending on model) alloy steel chain with a zinc-alloy cylinder that resists basic cutting and drilling tools. While no lock is completely impervious to determined thieves, this construction raises the time and effort required to defeat the lock—deterrence that matters in everyday public environments.

• Hardened alloy steel chain links reduce quick bolt-cutter access.
• Zinc-alloy lock cylinder offers drill resistance compared with cheaper cores.
• Multiple thickness and length options let you choose higher security levels.

How do I set and reset the 5-digit combination?

NDakter uses a keyless design with a default code (00000) that you change easily; no key is required so you don't risk losing it. Resetting follows a simple sequence (included with the product) so you can personalize the code and update it whenever needed, giving both convenience and control.

• Default code ships as 00000 for immediate use.
• Step-by-step reset instructions included for quick personalization.
• Ten thousand possible combinations lower the odds of random cracking.

Will the protective fabric sleeve really prevent scratches and weather damage?

The chain is wrapped in a polypropylene fabric sleeve that cushions contact with paint and reduces metal-on-frame abrasion. The sleeve also provides a more comfortable grip in cold or hot weather and helps keep the chain cleaner for longer.

• Durable, wear-resistant polypropylene protects bike finishes.
• Insulates hands from extreme temperatures when handling the chain.
• Sleeve helps resist moisture and surface corrosion on the chain links.

What length and thickness should I choose for my use case?

NDakter offers lengths from about 2.62 ft up to 6 ft and link thickness options (4/6 mm) so you can match portability with security. Shorter, thinner chains are lighter and easier to carry; longer, thicker chains secure multiple bikes or larger immovable objects.

• 2.62–3.2 ft: compact and travel-friendly for quick stops.
• 4.27–5 ft: balanced for locking to trees, poles, or two bikes together.
• 6 ft and thicker links: best for securing multiple bikes or bulky objects.

Who is this for: NDakter’s chain lock is made for commuters, urban cyclists, scooter owners and anyone who needs a flexible, keyless security solution that balances portability with tougher-than-basic protection. It’s ideal if you want to avoid keys, custom-set your code, and have a fabric-sleeved chain that protects your frame while offering multiple length and thickness choices. Remember: use a robust locking point and avoid leaving any vehicle unattended for long periods in high-risk areas.