Absolutely stupid screw design. The Ray ban logo has screw embedded into it, which means the Phillips head screws are actually threaded nuts rather than screws. One fell out and there is no way to find a replacement for it because it's so non standard. I contacted ray an and they sent... SCREWS which is exactly the opposite of what I need. Avoid these glasses unless you are confident you'll never lose a screw/nut/whatever you call it