Useless product - 'super magnets' are not. When used as intended, the unfixed part used to indicate the location of the socket is just "kinda" aligned with the part plugged into the socket. It's more accurate and a lot cheaper to just use a drywall saw, miter saw, or rotozip at the exit (measuring plus or minus an inch or two isn't that hard, is it?!) and then cut, find the edges of the box, and then "cut".
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