The security fence clip has a specially designed nut and a security housing.
In order to tighten or loosen the anti-tamper clip you require a anti-tamper spanner. These come fit with a male head that can connect to the female part of the security (anti-tamper) fence clip nut.
Once this tool is used to tighten the clip it is then housed within the security housing. This means that people cannot gain access to the nut to undo it, unless they also have an anti-tamper spanner.
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