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Number 4 screws fit the mounting holes just perfectly, and, if you get them with Filister heads, the heads will just fit between the terminal strip set-screw tubes.
...be forwarned that you need #2 x 3/4 inch screws to mount these terminal strips (the mounting holes are tiny, and the head of the screw has to fit between the encased terminal scews). You can get #2 screws from the Internet, but probably not at your local hardware store or home center. Aside from that, these make great termination points for all those home automation projects!
Work well for most connections. The screw tip cranks directly on the wire, so fine strands might be damaged. Tin stranded wires before using.
Some reviews comment about tiny mounting hardware. It's easier to install a mounting screw from underneath. A short #6 sheet metal or wood screw will hold the terminal block to a plate or board. No nut is needed.
The mounting holes in these nylon bodied strips can also be tapped easily. For this 7 amp size, use a # 6-32 tapered tap. Fasten strip to the project's wall or other surface
by installing the machine screws from inside the enclosure.
Larger sized strips, use # 8-32 or # 10-32 tapered taps depending on the strips' mounting hole size.
This fastening method makes for a neat and clean, reliable mounting means.
As for the reliability of the strips themselves, I have used dozens of them
over many years in various environments without any problems. I do, as a matter of course, check the tightness of the terminal connections whenever I am accessing the circuitry where they are used. Agree with the tinning advice for stranded, and these work fine with 18 AWG solid copper conductors.