Neodinium only
I'm surprised that the 2mm magnets are able to operate Hall sensors.
I used the 20mm magnets to hold ceiling reflective insulation in place in my shed while the silicone adhesive sets.
Product code: D-D25.4H3.175-N42
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The Pull Force listed for each magnet is based on lifting 10mm thick steel vertically. Magnets on a vertical surface (of 10mm thick steel) are generally able to hold around 30% of the pull force listed due to the effects of gravity and the lack of traction between the surface and the shiny magnet.