Ingenious system of multi-purpose, screw-on wire connectors which delivers superior connections without any tools (except for stripping). It locks wire ends, taps hot wires and holds fuses without any installation problems and within less than a minute. No crimping, no soldering, no nothing. Of course, all connections are reusable and may be separated at any time.
When in-line connections are not needed. Cost saving, with no metal parts.