1.lock nut,steel lock nut,conduit fittings 2.used for securing threaded or connectors with tapered or straight thread We are the manufactory of conduit fittings,produce in large quantity1. lock nut,steel lock nut,conduit fittings2. used for securing threaded or connectors with tapered or straight thread ,to a knockout or unthread ed slip hole3. available size:1/2 to 44. outer packing:carton