Plumb Bob Catch Set (Plumb Bob Catch And Plumb Bob)

[Features]
· Magnetic attraction force is 18 kg.
· Can also hook onto the post nails.
· This has a freely stoppable, automatic cord winding function.
· The thread thickness is 1 mm, and the thread through hole is 1.8 mm.
[Applications]
· Iron structures, beams, round separators, aluminum sashes, and other vertical measurements.