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https://www.powerful-magnets.com/products/rubber-coated-neodymium-disc-magnets-22-mmthickness11.4-mm-holds-approx-7.1-kg.html

ShapeDisc
MaterialNdFeB
GradeN42
Diameter22mm
Thickness11.4mm
Strength7,1 kg
Working  Temp. Max.80°C
Weight24g

The waterproof neodymium disc magnets 22x11.4mm are fully coated with rubber,N42 grade give them about 7.1kgs magnetic force, which is powerful enough for most outdoor daily uses.

For more information about rust proof magnets, please feel free to contact us!