





ROCKBROS 8mm Heavy Duty Anti-Theft Bike Chain Lock with Key - 3 Feet Long
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Shipping Fees:
We provide clear and detailed shipping fees based on the order amount and shipping method:
- Standard Shipping:
- Order Amount Below $29: Shipping Fee - $4.99
- Delivery Time: 3-4 business days
- Free Shipping:
- Order Amount $29 and over: Free 📦
Shipping Info
- US Warehouse In-stock: 3–4 business days
- 🌍International Shipping (if US out of stock): 7–10 business days
- 🚲Bicycles: 20–25 business days
Please note that we do not charge any additional taxes.
We offer a 30-day hassle-free return and exchange policy starting from the date you receive your item. To be eligible, products must be unworn, unused, with tags attached, in original packaging, and accompanied by proof of purchase. If the item is defective, damaged, or incorrect, we cover the return shipping cost; for size or personal preference returns, the customer is responsible for shipping fees. Please inspect your order within 72 hours and contact us for any issues. EU customers have a 14-day no-questions-asked return right. Refunds will be processed within 10 business days after we receive and inspect your return. Please contact customer service before returning items and send returns to the designated address; unauthorized returns will not be accepted. For questions, email service@rockbrosbike.us.
At ROCKBROS, we offer a worry-free 1-year warranty to ensure your satisfaction. Whether it's a defect or product issue, simply reach out to us at service@rockbrosbike.us with your order details. We'll handle the rest to make sure your experience is smooth and hassle-free.

Product Highlights
FEATURES
Product Description
- DUST RESISTANT & PRACTICAL DESIGN: ROCKBROS bike chain lock adopt an embedded waterproof cover for keyhole, preventing rain and sand from entering the interior of the lock core, reducing the probability of corrosion. It also solves the problem of traditional lock cores being easily affected by dust and causing jamming, ensuring smooth and reliable use.
- SCRATCH-PROOF NYLON PROTECTION: The bicycle chain lock is wrapped in a thick, high-quality nylon cloth cover, which is wear-resistant and non slip, effectively protecting the chain from being rusted and scratches while keeping the bicycle from scratch.
- STURDY & DURABLE: With 8mm thick security chain lock, our bike chain lock is made with zinc alloy which is not easily damaged. The chain undergoes multiple heat treatment processes such as quenching, making it more solid and firm, anti-drilling and anti-cutting.
- EASY TO LOCK: You can easily snap the bike chain lock to securely lock it without the need for keys, making it more convenient and user-friendly. Our bike chain locks are provided with 2 keys, so you don't have to worry about losing them and being unable to unlock the lock.
- SAFETY AND ANTI-THEFT: The bike chain lock contains 8 all copper blades, and the key adopts a snake shaped groove design, which has a low mutual opening rate and reduces the probability of your properties being stolen, providing excellent anti-theft performance