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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.

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