The Electronic Specialties Heavy Duty Insulation Piercing Test Clips, No. 142-3, are sold as a set of two probes and are designed to work with most DMM/Scope test lead kits currently in use. They will connect to the main test lead in the kit via straight banana plug connection. These probes are designed to pierce wire insulation and tap readings in wires where a direct connection is not possible. After use, special care should be taken to seal the point where the wire was pierced.These probes feature CATIII 1000V safety rating. The maximum test current is 5 amps.