Electronic Specialties 618 Green/Yellow/Red/Black 3.25 x 0.25 x 0.25 Mini Back Probe/Wire Piercer Great for back probing weather pack style connectors used with numerous automotive sensors Also very handy for piercing and tapping readings on smaller gauge wires - using the included probe adapters Works with most Test Lead Kits in the field - with standard 4mm banana plug test lead Set includes four probes - red, black, green, yellow Test probes 21 mm length