I used them to install two 7" Truck Lite (Rigid Industries) headlights on a W463 Merc. The brackets (rings) are solid metal, very well constructed and sturdy. However, the holes in the bracket (which attach the headlight to the bracket) are not threaded at all. All three of the rings I ordered were unperforated. So the screws that come with each ring are useless. This was a relatively easy fix if you had a faucet kit. Here's what I ended up doing.
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