Review on Insulated Wire Electrical Connectors Assortment by Cory Jacobson

Absolute junk. Be sure to check the crimp by pulling on the connection as they have a tendency to loosen when crimped with an insulated connector crimping tool, even if the connector has been crimped all the way around the wire. I found that if I used an uninsulated die on my crimping tool and crushed it, damn it, they basically held. I threw my set in the trash. These connectors can cause you a lot of trouble when troubleshooting loose connections.