358 comes from its measurements 3"×0.5"×8 gauges=76.2mm×12.7mm×4mm (length×height×diameter).
358/Clearvu fence is extremely difficult to penetrate, with small mesh aperture being effectively finger proof,
and extremely difficult to attack using conventional hand tools.
It is recognized as high security/high strength fencing, the most difficult to break through, difficult to climb and cut.