This plumb bob can be fixed on wood, masonry wall surface, and this can accidental injury to working for you This plumb is nylon thread, which is easy to identify, wear-resistant and not easy to break This wire plumb bob adopts with adjustable ranging for different construction situations This plumb setter adopts with carbon steel hammer to provide stable performance This plumb bob has strong magnet on the side for easy attachment to iron objects, Manufacturer: XIAOQENAN