This type of magnet is manufactured to be screwed into the wall next to a screw with the right head.
Countersunk neodymium pot magnets 100 x 12.5 x 23.8 x 22 mm, force 400 kg, 1290g, 80ºC, IMA 100 NdCv
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Availability date: 02/01/2016
They are products that thanks to their magnetic force with direct contact with metal parts allow the fixation of ferromagnetic products such as lamps. They do not leave visible marks of holes.
Oxidation? these magnets are coated with nickel to protect them from corrosion. It is recommended to use them in interior locations and without humidity.