I've got a bunch of these. They're solderless cables. You cut, you push, you screw, it works. Much like George L's but very reliable, as a matter of fact I only ever had to redo / cut them when I needed a different cable, not because they stopped working. I've been using them for ever, say they probably were bought in late 80's. I'd like to get more if they still exist or at least check what the manufacturer has to offer nowadays. Problem, I have no idea who made these. No brand on the connectors or cables. Any idea ?