NUT NYLOCK NC 1/2|Nylon Insert Lock Nuts typically have a cased metal outside formed into a hex pattern easily torqued by a wrench or socket.
Internet Drop Down Category=5290|Item Type=S|Master Pack Unit of measure=EA|Size=1/2 in.|Style=Nylock Nut, NC|Unit of Measure=EA|Weight=0.0390|Brand=Andersson Supply