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Zefal K-Traz C6 Cable Lock£12.17
This outstanding cable lock is affordable and helps against moderate risk areas. What's most impressive is it includes the world's first patented springless locking system to prevent the bolt blocking. Its mounting clip means you can easily transport it by attaching it to your frame and can be used on any tube up to 23mm in diameter.
Finally, it comes with two keys for extra security in case of loss. This stunning model is also great for use as a secondary level of security alongside your existing lock.