Fencing Clamp Anti Tamper Spanner Tool Female TypeThis specialist spanner is for use with our fence light. It features a special end that can tighten or loosen the anti tamper fixings present on the clamp fitting. The alternate end of the spanner features a 21mm fitting for undoing 21mm nuts. The Right Tool For The Job There is nothing more frustrating than not having the right tool for the job. Below we've put together a quick look at each of the tools we have on offer and which security type it is