Need to join two wires and you don't want to heat a soldering iron or hunt for heat-shrink tubing. Push your conductors in, squeeze the connector shut, and the internal blades cut and crimp in one motion. That's the whole job. Nylon insulation is rated to 105 °C, so it handles the heat under a panel without getting soft. Six blue connectors for 16 to 14 AWG wire in the pack. If you're working with thinner or thicker gauge, the red (22–18 AWG, PT-4537) and yellow (12–10 AWG, PT-4737) variants are right there alongside it