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The TB-LOK2 ThunderLok Thunderbolt Cable Lock (Two-Pack) from Sonnet secures Sonnet's Thunderbolt cable to the Echo Express SE I and SEL chassis, preventing the cable from becoming unintentionally unplugged. It uses a thumbscrew to secure it to the Echo Express chassis' threaded hole and remains attached to the cable to prevent loss. This item is a replacement part for the Thunderlok included with the Echo Express SE I and SEL.