PERFECT FOR SETTING VERTICAL LINES: This magnetic plumb bob and line set is used to accurately mark vertical lines on walls before wallpapering, fixing pipework or hanging a cabinet. VERSATILE: It can be fixed to ferrous metals with the magnet and to stud walls, plaster board, MDF, plywood, etc by using the clip or steel strike pin. STRONG MAGNET: The bob weights 400g (14oz) and has a strong magnet.