358 Anti Climb Fence The 358 fence is named for its small-sized anti-climb welded mesh panels, with specifications of 3 inches × 0.5 inches × 8 gauge mesh panels, equivalent to a mesh aperture size of 76.2 mm× 12.7 mm× 4 mm. Due to this unique structure, the 358 fences,are widely recognized as the most difficult-to-penetrate rigid grid fences. The difference lies in the diameter of the wires. It is virtually impossible to damage it using ordinary cutting tools. Since it