Hook-up wire is an insulated single-conductor wire that is ideal for a variety of electrical applications. It can be used in electronic equipment, automotive and marine applications, ovens, control panels, building construction, appliances, and many other open and enclosed environments. The wire is insulated using PVC, PTFE/Teflon, or other materials. The conductor can be stranded (multiple thinner strands bundled to equal a thicker gauge) or solid (a singular strand of wire), and can be bare or tinned. Many types of hook up wire are also made to meet certain UL and MIL-spec specifications.