OK. Could be improved
This is my third pair of these glasses. The small screws that hold it together eventually fall out and no replacement screws are available. So the first thing I do is put locktite on all the screws which should be done in the factory. The second pair the spring "hinges" failed and could not be repaired easily. I also lost a nose pad which was not replaceable. The frames are metal and rugged. With just a few improvement especially the availability of replacement parts these glasses would be 5 stars.