Allen wrench is L-shaped hexagonal rod wrench, dedicated to the wrenching socket head cap screws on the side of the model is based on the size of it, the bolts of the size of the six-party national standard metric specifications: 1.5,2,3,4, 5,6,8,10,12,14,17,19,21,22,23,24,27,30,32,34,36mm. Inch specifications: 5/16 "--2-3 / 8" 26 kinds. Cangzhou Dean Safety & Special Tools Co., Ltd., is an independent, authoritative and professional manufacturers, the main production of "security" brand high-grade beryllium copper and aluminum bronze proof tool. Allen wrench proof tool is a tool for flammable gases places, made of aluminum bronze, beryllium copper alloys. Widely used in petroleum, chemical, and other potential fire and explosion hazards in the environment, but also good mechanical machinery essential for the maintenance tools. Both qualities can play a proof function, and where beryllium alloy products can also play a shielded function. Currently in the domestic production, sales, distribution of explosion-proof tools 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 material is a high purity copper matrix by adding an appropriate amount of beryllium, nickel and other metals, copper-based alloy composition. Thermal conductive properties of these two materials are very good.