Hi Linda, if you're looking to hang a mirror I would suggest finding a stud in the wall to put the hanger on. Mirrors can be REALLY heavy!
Hi Linda, hope this is what you were looking for.
Usually you position the top cleat at the top of the frame make shallow holes and attach with screwsMore
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Hi Linda: Here are some sites that are sure to help:
Here is a conversation regarding this, too:
Hello. Mirrors can be very heavy.
I suggest using the French cleat system to hang if your mirror is large. There are videos online of what this looks like and they are sold in the box hardware stores
Perhaps this will help: