... steel wall plug, nylon frame anchors, metal frame anchors, bolt anchors, hollow wall anchors and so on), accessory for ... , hex coupling nuts, flange nuts, square nuts, etc.), flat washers, spring washers, mudguard washers and so on. Our main ... , black zinc plated, black phosphatization finishing, grey phosphatization finishing, brass plated, nickel plating, hot dipping, machinery zinc plated, etc. ...