"358" comes from its measurements 3" x 0.5" x 8 gauges which equates to approx. 76.2mm x 12.7mm x 4mm (Length x height x Diameter) in metric. "anti-climb": smaller openings, no place for toe or finger to hold this 358 security fence also named anti climb fence ,prison wire mesh fence. also it can use as airport fence, highway fence,sport fence for security of crowd ,animals ect.