- Advanced Die-Forged Process: Used to loosen and tighten large hex bolts and nuts with a hammer. The 45-degree deep offset efficiently clears obstacles. One-time die-forged for high hardness and strong torque, fully in accordance with German DIN standard. - High quality Raw Materials: Aluminum bronze non-sparking for operation with ethylene concentration below 7.8%, standard code GB ExⅡB, non-magnetic, hardness 20-30 HRC. Beryllium bronze for hydrogen operation with concentration below 21%, standard code GB Ex IIC, hardness 30-40 HRC. - Application: Non-sparking striking convex box wrench for clamping, assembling and dismantling pipes and shaft parts. Widely used in petro-chemical, oil production, gas production, oil and gas pipelines, power generation, mining, plastics, chemical fiber and related industries. - Safety and Professional: Aluminum bronze and beryllium copper minimize sparks during friction or striking between tool and work pieces. To ensure explosion-proof performance and stable mechanical performance of the non-sparking tools, the manufacturer has invested 20 million yuan to establish the only national laboratory in the field of non-sparking tools.