Avoids poking holes in the wire. The small diameter probe can slip into the back of the wore connector and make connection with the signal under test.
Although piercing the wire is not advisable, sometimes it just can not be avoided. This set of probes can work with most standard test lead kits in the field, such as ESI 142 and ESI 143 for example..and other brands too.
Great for backprobing 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