Don't Buy Them. They don't have a metal rod squeezing the wire. See image. They only have a small metal speck under the receiver. Not enough to secure the wire. I used 18g wire and after crimping with my Greenlee crimping tool (with the smallest nozzle) the wire was able to move and pull out. A small metal surface for crimping is not enough. Also, there were some that didn't have the inner metal. Just an empty plastic case. If you are looking for a reliable connection, this is NOT the one.