These Wire Lever Nuts work great and make it a lot easier to install multiple light fixtures with mixed wires. . This does not allow proper wiring in the electrical box and leaves a "dented" bird's nest, as can be seen in the picture. Lever nuts allow the building wires to stay in place when changed if necessary. I gave them 4 stars because I was able to get the wires out of the lever nut. Not exactly a fair pull test, I clamped the lever nut in a vise and used pliers. Sure, the plastic on a standard nut will snap, but the threads will stay in place for the same test. The lever nut seems less durable but much better than the inserts on the bushings. Much better overall because they save time. If the wires come loose, the terminals become loose, there is corrosion or cracks on the case I will update the review.