[Al Skierkiewicz]

EVeryone,
The basic rule of a good soldering job is that both wires reach a temperature that will allow the solder to flow in between the strands of the wire.
These devices were developed for soldering a jumper wire to coaxial cable. The ring is meant to solder to the strands of the coax shield. In general, the shield uses very small stranding. These could be useful for emergency soldering of a broken wire but they are not fool proof. Do not trust them to have good mechanical strength. The two rings of non-metallic material are for water proofing. In use on coaxial cable, these would seal on one side to the outside jacket and the other side would be around the inner insulation surrounding the center conductor.