When attached to the wall and back of an object, they have absolutely no room to slip. In other words, they fit together too tightly and it takes a lot of force to lock them. REVISION: When assembling 2 parts when only connected to the object to be hung it was difficult, once I fixed the 2 parts to the wall they are quite simple and well connected. I have no problems with them and will use them again. I also had no problem with other comments about sharp edges etc., you work with tools. If a small sharp corner is a problem, perhaps power tools, screws, nails, etc. should be avoided.
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