Red "Stud Magnet" stud finder. 4in.L x 7/8in.W x 1in.H. Comes with a red magnetic shield which blocks the magnetism when the magnet is not is use. This allows the Stud Magnet to be stored neatly in a toolbox or drawer by preventing it from attracting to other tools or nails. To use the Stud magnet remove the magnetic shield and move magnet against a wall to locate drywall screws or nails in the stud. Set nail in notched end for easy startup. Attach string and use as a plumb line guide for additional nails or screws. This product requires no batteries. Under normal use, permanent magnetism guaranteed.
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