Leads and probes connect DMMs or other test equipment to a circuit under test. Most DMM test leads use sheathed banana plugs, which have an insulated cover over the conductive metal plug. Basic probe/lead sets are like the ones that come as standard equipment with DMMs and feature probes that are permanently attached to the leads. In contrast, modular leads and probes allow interchanging clips and probes. Modular leads and probes are usually not included as standard accessories with DMMs. The leads and probes are joined together with a sheathed banana plug and jack, allowing the standard probes to be interchanged with alligator clips and grabbers, as well as many other connection methods.