Rack-a-tiers - 52300 stud ball magnetic stud finder - (qty 1) - assorted colors.
The Rack-A-Tiers Stud Ball Magnetic Stud Finder has such a strong magnetic pull that it can be left hanging on walls indefinitely to mark the location of studs. You can get creative and find other uses for the strong magnet, like using it to hold electrical tools up or for catching shavings from drilling into metal.
