What proof single-head wrench material is

Proof single-head wrench, explosion-proof wrenches, explosion-proof single-head wrench straight handle aluminum bronze alloy, beryllium copper alloy of two materials, mainly used in petroleum, petrochemical, oil refining, power generation, natural gas, gas stations, oil depots, gunpowder, military , explosive gas and other industries, is flammable and explosive industry repair, overhaul, routine maintenance necessary proof tools.