They cost 2.00 for 10, or for around twice as much you get 100. I bought the bag of 100 in the 3 port style. They go up to #12 solid or stranded (up to 19 strands). They are designed only for copper wire. My #12 wire was solid and it sort of 'clicked' into the connector. I tried to pull it back out but unless you use a twisting motion the wire will not come out. I pushed the shortened wire and the new connector to the back of the box and my problem was solved I probably won't get too much use from these since this situation doesn't (thankfully) arise too often, but for the times when I do need something like this they will be a real time saver. THANKS again Fencepost, the shortened wire is now one less thing for me to worry about.