De Neers - 1 Drive, 400 mm Impact Extension Bar has a core of molybdenum-chromium steel. The material gives this 1 Drive, 400 mm Impact Extension Bar a high value for tensile strength, which improves the durability and service life of the product. The extension bar is corrosion and oxidation-resistant. It is incredibly stable at higher temperatures, ideal for heated workpieces. The Impact Extension Bar increases the socket's reach to cramped spaces and fasteners lodged indeep recesses. The Extension Bar has an excellent black matt finish due to the phosphate salts of iron, zinc, or manganese
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