Here is an absolutely high quality product which makes additional screws unnecessarily. Even a quick check with the phase tester is possible through a slot at the front side of the terminal without any additional effort.
The connections are simply plugged after stripping in the terminal and look for the "snap" of himself (attention only in so-called. "Hard" links). For "soft" links, the terminals of the same Herstellters recommend to clamp itself to the possibility of the compounds by orange lever. However, these also require more space in the respective box / distribution, because they would be greater.
From my side as a layman a strong buy recommendation!