TOUHIA 2.54mm Pitch 4-Pin PCB Mount Screw Terminal Block Connector for Arduino, Rated 150V 6A - Pack of 20

They are okay, except when put in adjacent .1 holes holes. There is not enough clearance to sit comfortably.

I will buy again when I run out.Upon first touch and appearance, I thought these were cheap junk. HOWEVER, they actually work well which is what matters. I have not melted any of them with the soldering iron or heat shrink gun. The screws are captured, so they cannot accidentally fall out if you loosen them all the way. I have used them with 22 AWG wire and so-called "premium prototyping wires", and have not had any come loose from vibration or other causes at this point. They solder easily into 0.1" spaced holes. Really the only thing I don't like is that on a breadboard pattern circuit board, you can only put two adjacent 4-position terminals next to each other without leaving a one hole gap between the pairs (i.e. 8 termination points, 1 point gap, 8 termination points).

The terminal blocks are exactly as stated by the seller. They are spaced at 2.57mm (0.1 inch) and fit the blank prototype boards that I purchased earlier. The only reason it didn't get five stars is that one of the terminal blocks did not have any screws in it and they were not in the bag. Otherwise all is well.

The five star rating is only relative, any 2.54mm pitch screw terminal is going to be fragile and have limited capacity, if I were rating it relative to an "average" (larger) screw terminal I'd rate it much lower, but for applications where one is stuck with 2.54 pitch these terminals seem to pretty well make the best of a difficult situation.

Good, works for what I need, screws are fairly light duty.