Instead of fussing with screws, use a screwdriver to lift and release the clamp onto your wire. The spring clamps flatten your wire so it stays put when when vibrated or pulled.

These terminal blocks come mounted in an enclosure that you can pop directly onto walls or equipment. They also reduce hassle because you can wire your circuits before installing the enclosure. Enclosures protect the terminal blocks from water, oil, and corrosion. Knockouts make it easy to run wire in and out of the enclosure.