They are very easy to attach to the car visor. They can be opened very wide, but not by pressing on the back. I prefer to open at the front. They hold glasses really well. This is good for storing an extra pair of sunglasses in the car. I gave the product five stars because it matches the description, hasn't broken, there are no obvious problems and it works as it should. But I will say that the metal tab will be hot as hell in the summer, so be prepared.
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