"358" comes from its measurements 3"*0.5"*8" gauges which equates to approx.76.2mm*12.7mm*4mm(Length*Height*Diameter) in metric.
358 security fences are extremely difficult to penetrate.with the small mesh aperture being effectively finger proof,and extremely difficult to attack using conventional hand tools.
358 wire mesh anti-climb high security fencing specification as follow:
||square fence post 60*60*2.0/2.5mm,80*80*2.5/3.0mm
||Flat bar,metal clips
||electric galvanized/hot dipped galvanized then powder coated,hot dipped galvanized
358 wire mesh anti-climb high security fencing wire thickness:3.0mm,4.0mm,5.0mm