I recently added a NMEA 2000 network to my boat to connect the VHF marine radio to the chart plotter, so I needed to hook up the network power cable to the accessory switch used for those devices. The switch, of course, already had connectors attached, so I used these piggyback spade connectors (with the Wirefy crimping tool) to keep the connections at the switch neat and secure. And the adhesive/heat-shrink stuff worked great, even though the wires were thin. I'm very happy that it all worked well on the first try, because that hardly ever happens.