358 Fence, also known as Prison Mesh or Anti-Climb Fence, is a welded wire mesh panel system designed specifically for high-security applications. The term "358" refers to its precise mesh dimensions: 3 inches × 0.5 inches × 8-gauge wire, or 76.2mm × 12.7mm × 4mm. This uniquely tight mesh makes the fence extremely difficult to penetrate, cut, or climb — even with hand tools or bolt cutters.
Its virtually unclimbable structure, combined with high visibility from both sides, makes it ideal for surveillance and perimeter control without compromising security.
The panels are often paired with additional deterrents such as razor wire or electronic detection systems.