Purchased for use with a chandelier that required 2 sets of 16 wires. Driven me crazy until I stumbled across them. Amazing little things and I do small electrical chores myself sometimes and have never seen anything like it. Also check out 773 if you need even more connections, bought some of them at the same time but didn't use them. They don't seem to be as good for stranded wire, which is what light wire is made of (better for solid wire), but 221er did the job didn't need them.