I am impressed with the quality and finish of these instruments; They don't look like cheap stamped junk like you might expect at this price point. BUT they can be a bit thicker than 3mm which means they don't fit exactly where I need them. It's ok I can sand them down but now I lose that nice chrome finish. I measured some of mine at .123 inches which is 3.12mm. Others meet or are slightly below the 3mm specification.