The Electronic Specialties Pro Auto Test Lead Kit, No. ELS200, includes a full range of accessory test leads designed for automotive, heavy duty, and marine electrical troubleshooting. The extra sharp test leads have an extended length of 64", and each accessory test probe connects with the main test lead via straight banana plugs. The kit includes four back probes, which double as wire piercers using the included adapter heads. These are used to back probe intact electrical connectors, or tap smaller gauge wires for live readings. The included crocodile clips open wide enough to clip onto battery posts for ground connections. The cable/insulation piercers can be used to tap live readings on large gauge wires.