Here defective to two thirds ...

This product unfortunately come true again that you buy cheap products are always twice.
I ordered three screw connectors, only one of which worked, so is smooth and can screw it to stop.
The other two are total failures. Here is each thread damage (screw threads pressed), so that they can not turn and they therefore can forget for your intended use. Can I do think that one ordering of only three screw connectors already expect a final check takes place whether the product works at all before being plugged and sent into the box. More than a star is therefore not justified in my opinion.