A bit disappointed in these clip-on sunglasses.

First of all, the "bridge" [which fits between the lenses, and holds the spring clip-on mechanism] is NOT stamped metal as shown in the photos.  The bridge is plastic, a much more typical construction. Also, the bridge's thick plastic top-piece actually interferes with mounting the clip-ons; the sunglasses will fit higher than normal [unless you trim back the plastic a bit, which is easy to do].

Secondly, the flip up/down function was weak on one of the clip-ons I received.  The sunglasses didn't "snap" down--they had to be guided down with constant pressure.  The other sunglass flip mechanism worked well, as expected.

On the plus side, the sunglasses are optically clear with no distortion, and a good value [particularly if you only want dark lenses].