What is the 358 guardrail? Why is the dense mesh called 358 guardrail?

The 358 guardrail is a dense mesh guardrail mesh. Due to its unique mesh size, it is generally used for security protection in airports, prisons and other places.   The origin of the name of the 358 guardrail:   "3" corresponds to a 3-inch long hole, which is 76.2mm;   "5" corresponds to a short hole of 0.5 inches, which is 12.7mm;   "8" corresponds to the diameter of No. 8 iron wire, which is 4.0mm.   So to sum up, the 358 guardrail is a protective mesh with a wire diameter of 4.0mm and a mesh of 76.2*12.7mm. Because the mesh is extremely small, the mesh of the entire mesh looks dense, so it is called dense mesh. .   Because the mesh of this type of guardrail is relatively small, it is difficult to climb with ordinary climbing tools or fingers. Even with the help of large scissors, it is difficult to cut it. It is absolutely no problem in terms of safety protection!