Lindy SFP port blocker prevent unauthorised use of SFP ports to access networks and systems. They plug into the RJ45 ports with a special insertion key and can only be removed using a key of the corresponding colour. 10 x SFP Port blockers and a green key Blocks unauthorised access to SFP ports The blocker plugs into the port and prevents users from inserting SFP cards Port locks are almost flush with the port front to prevent forced removal without a key Set of 20 blockers without a key (ref no. 47913), key (ref no. 47911) Each key works only with a lock of the same colour Please note: The lock will only act as a basic physical and visual deterrent to tampering. It will not prevent a determined attacker, intent on gaining physical access to a port.