A version of my popular "Tritium Fob" this version is made to be damn near imposible to kill, not that the origional was at all easy. This model includes a center ring in the vertical bars to reduce the amount of stress that can build up in one bar, if for whatever reason lots of pressure is applied to it. PLEASE ADVISE: You will need to drill/grind the inner diameter to 3mm, as the production process often leaves behind bumps and material in the hole.