I needed to find studs through plaster walls and ordered them to help. These are small but very powerful magnets and they worked! Be prepared to spend some time looking for nails, but once you've found one, the next one will be easier to find since you can estimate the distance between nails. I marked the position of the rivets with tape and thanks to these little helpers the project turned out great. Having worked through plaster I think finding screws in drywall would be an easy task for them. I would recommend her!
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