FIRST4MAGNETS Ferrite White Painted Clamping Magnet with M6 Hook for Hanging, Holding or Displaying Items - 50mm Dia - 21.3kg Pull

Good strong magnet, although I have had stronger ones, this certainly does the job.

Strong pull force, although not measured. The magnet pull force is greatest when put on a ceiling for example, and something hung off it, rather than against a wall. This is because the magnet will slide down a wall, but can't slide on the ceiling. if that makes sense.We're using it with "s" hooks, to hang a cable off a ceiling.

Excellent.

Absolutely rubbish meant to have 21kg of pulling force but cannot even hold two lightweight coats don’t waste your money