Explosion proof 12 "square 28 piece boxed sleeve material: aluminum bronze, beryllium bronze aluminum bronze material, working surface hardness HRC25 ° or above, tensile strength not less than δ B 75-85kgfmm2 is a national grade IIB product that does not ignite gas when operating in ethylene gas with a concentration of 7.8%; Beryllium bronze material, working surface hardness HRC35 ° or above, tensile strength δ B105-120kgfmm2, a national IIC grade product, does not detonate gas when operating in hydrogen gas with a concentration of 21%; Beryllium copper alloy explosion-proof tools also have special anti magnetic functions, which can be used normally in working environments with magnetic fields. The above two materials of explosion-proof tools can effectively prevent flammable explosions caused by friction and impact between tools and working objects, confirming national property and personal safety! Applicable places: petroleum, chemical industry, mining, anti-terrorism, anti magnetic field, coal mine, gas production, oil and gas pipeline, power generation, metallurgy, excellent quality, aviation, storage and transportation, pharmaceuticals, gas production, plastic, chemical fiber, leather, fireworks, firecrackers, etc