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https://www.powerful-magnets.com/products/internal-threaded-rubber-coated-base-magnets-22x6mm-hold-3.5kgs.html

Diameter22mm
Thickness6mm
ThreadM3 - M6
Weight(g)9
Colorblack
Pull Force(Kg)3.5

It' s smallest rubber coated waterproof magnets that with internal thread mounting hole,standard size is 22mm in diameter and 6mm in thick,they hold about 3.5kgs, the thread range from M3 to M6.
For more information about channel magnets, please feel free to contact us!