What proof single-head wrench specifications is

Proof single-head wrench is a special security special tools, the use of copper as the substrate material in the multi-element made of non-ferrous metals, their specimen materials and precious metals for military synthetic, made tools have appear before golden is an internationally recognized proof tools a definitive proof single-head wrench is widely used in petroleum, petrochemical, oil refining, oil depots, gas stations, chemical, mining, coal, oxygen, pharmaceutical, metallurgical, gunpowder, leather, plastics and other industries , production safety necessary special tools. Proof single-head wrench to stay with reasonable design, stable structure, high material density, strong anti-strike capability, not off, constantly, bend, high dimensional accuracy, durability and other characteristics.