I bought these mainly to temporarily connect small controllers to circuits. I planned to run the wire through one side of the clamp and screw it to the screw. But the metal is so thin, the screws have already snapped off and don't twist. I gave it 2 stars because apart from the flaky screw it works as expected. The clip holds tight, the plastic insulation seems solid. It may be possible to crimp the wire for a stronger hold.