the s position for proper drilling and secure mounting of supports, fixtures and fittings magnets, a powerful rare-earth alloy, the Wall Finder’s penetrating field attracts and attaches to steel items like nails, screws, cable and pipe clips A useful top hook in the Wall Finder allows tying of a cord or string. Swung freely along a wall, it will pull itself towards concealed nails or screws Ergonomic design,Soft grip for easy grabbing and gentle touch.Easy to use,Compact size,No batteries required Powerful magnets allows hands-free use.It senses a change in density in the space behind the wall and locates the center with great accuracy, Manufacturer: KACCDE