De Neers - 3/4 Drive, 400 mm Impact Extension Bar is a ubiquitous tool in auto shops, builders' toolboxes, and professional mechanic's kits. The 3/4 Drive, 400 mm Impact Extension Bar has an outer layer of black phosphates. It contains crystals of iron, manganese, or zinc phosphates and forms a protective covering over the outermost layer of the Impact Extension Bar's core material. As a result, the Extension Bar has high strength and temperature resistance value. In addition, the extension bar is unaffected by the common corrosive elements. The extension bar can handle continuous impacts from the wrench while transferring force.
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