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Quickly and easily block physical access to RJ-45 Network ports. Prevent users from inserting cables, devices or foreign objects without permission. Single key and 10 x RJ-45 blockers. Individual keys and pack of 20 blockers also available. With the Lindy RJ-45 Port Blocker Key, the user can quickly block open network ports and easily prevent users from connecting cables, devices or inserting foreign objects without permission.. This helps protect against unauthorised access to a network or system, as well as preventing unintentional or malicious damage to ports. It can also act as a visual cue, showing inactive or disconnected ports, ideal for use in schools, office or other public sector e