This is a 2-pin screw terminal with 3.5mm-pitch pins. It has a slide-locking feature so you can string them together to form any size you need (up to 20 without problems). The terminals are rated up to 125V @ 6A and they can accept 30 to 20 AWG wire. The 3.5mm/138mil pin pitch will not fit standard 0.1" perf boards, nevertheless this is a common pitch for screw terminals.