These 4mm banana plugs are a premium choice for engineering labs, test labs, and even hobbyists with maximum electrical contact! They allow very dynamic development environments. Test setups can be changed in a matter of seconds without having to re-assemble, re-solder, or re-crimp cables. Ever try to add another test set on top of another one? Traditional setups of banana plugs don't allow existence of multiple test sets like these do. Power connections very often complicate the setup and require permanent changes to the cabling. Unlike traditional banana plugs, these banana plugs always allow additional test sets to reside on the same test station, enabling one station to serve high mix applications! Use a 3.4mm (0.135") wide flathead screwdriver (or smaller) to secure wire to plug. Search for all colors available from Red, Black, Green, Blue, and Yellow. These supercede T4SI Original Banana Plugs.