Overall they are easy to use and appear to be durable. I installed a swing shower door on a cheap fiberglass shower that is 18 years old. After years of being disassembled for cleaning, the bolts holding the door to the fiberglass eventually stretched beyond the new bolt size. I ordered them, drilled the original holes and had to enlarge the holes in the door frame. I also added an extra mounting hole to keep the pressure even along the fiberglass and hopefully avoid cracking over time. They are firm and seem to be holding the door perfectly. There is no free movement from the door or fiberglass flex. My only complaint, it would be nice if the switches came in a storage box rather than a mailer.
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