This kind of Carbon Steel Zinc Plated Square Nut is made of high quality carbon steel with fine workmanship. Its surface is plated with a layer of zinc for aesthetics and rust prevention. It usually cooperates with bolts (studs or screws) with external threads and uses internal and external thread connection to fasten two connected parts, components, etc. When assembling and disassembling the Carbon Steel Zinc Plated Square Nut with a wrench, it is not easy to slip, but you can only use an adjustable wrench, a dead spanner, a dual purpose (opening), or a special square-hole socket wrench for assembly and disassembly.