These are useful little leads for all sorts of elecl and electronic work. Add this to your meter bag. when you need a third hand, or have to test many circuits sequentially, this is an absolute necessity. nice rubber insulation and the banana plugs mate easily with a regular bench power supply or a regular meter.The leads are supple fine wire 22 AWG. Voltage: 500V; Current: 5A. Banana Plug: 4 mm. The banana ends are a molded stackable style of connector. These multimeter leads is convenience to use for different purpose of use. There are 5 different colors(Red, Black, Blue, Yellow, Green) make people easy to distinguish. It also has a smooth feeling when you touch it.The Test Hooks are just right for attaching a multimeter to a breadboard circuit. It very handy for checking circuits in experimental designs. The wires are very flexible and the connectors work well.Stackable banana plug to test hook wire cable are frequently used in school physics laboratories to quickly and cheaply assemble circuits. They are useful for connecting components to wires. Ideal for use in labs, service shops, schools, home and industry.The Stackable banana plugs are pass through so you can plug another set of leads in and have two active pairs at the same time. That would allow you to quickly use another style lead without having to plug and re-plug leads in.