Allen wrench proof tool is a tool for flammable gases places, made of aluminum bronze, beryllium copper alloy is widely used in petroleum, chemical, and other potential fire and explosion hazard environment, but also good mechanical manufacturing mechanical maintenance necessary special tools. these two qualities can play explosion-proof function, and where beryllium alloy products can also play a shielded functionality present in domestic production, sales and distribution of explosion tool to distinguish the material can be divided into two categories: 1. aluminum-copper alloy (commonly known as aluminum bronze ) proof tools, specific material is a high purity copper matrix by adding an appropriate amount of aluminum, nickel, manganese, iron and other metals, copper-based alloy composition 2. beryllium copper alloy (commonly known as beryllium bronze ) proof tools, specific materials based on high purity copper matrix by adding an appropriate amount of beryllium, nickel and other metals, copper-based alloy composition. these two thermally conductive properties of materials are very good. T- Allen wrench