I bought 3 dimmers. In 1 of the 3, one of the 2 screws that tighten the live and neutral wires (the live one in this case) was loose. From my own stash, I took other screws with larger diameters to replace it, and even those were loose. For a job that should take 15-20 minutes and for all 3 dimmers in 3 fixtures in the same space, I had to come up with makeshift solutions for one dimmer due to a loose socket screw and waste time and effort with the possibility that my work might not be completed! I am tired of encountering such unacceptable issues in electrical work - material defects! 3 stars because the dimmers as mechanisms worked correctly.