Bought some adjustable tint sunglasses and didn't like that I had to adjust the tint for each lens individually. These gears couple the lenses so that they will always have the same tint.

They should be a tight fit on the glasses, might need some post-processing (sanding away z seams) to get them to fit

There are multiple variations of these sunglasses, The ones I have have 52mm lenses. You might need to make your own gear holder if the bridge is different.

These were the specific glasses I bought: https://www.amazon.com/dp/B0F2ZQLXRS?ref=ppx_yo2ov_dt_b_fed_asin_title