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The stainless steel Security Nut offers practical and efficient locking for its rider by remaining permanently fixed to the bicycle with a magnetic lock. No more carrying cumbersome chains and heavy locks. Its retractable strap, rolled into the nut, is made of woven cut-resistant fibers that extend up to 2 meters. Once locked, the strap can only be released by inserting a serial key fob. If cut, an SMS is sent to the owners mobile to alert them.