These lil' doodads have a preeeety strong attraction to eachbother n metals.Im having to use the adhesive to attach magnets to inside of round steel pipe /mailbox is homemade by steel eorkers.Thus, to get the door to my mailbox to stay shut, tge small (0.75cm) ends of magnet have strong enough attraction to keep a 4lb metal door closed . Works for me!
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