These steel discs are not magnets, but instead are used as a striker plate which magnets are attracted to or as keepers to create a closed magnetic circuit. These steel plates are reduced-to-clear as they have a plain hole, rather than being countersunk on one side.
Pack of 50.
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Steel discs are a perfect solution for installing a magnetic surface that magnets will stick to. For example, you could screw one of these discs into a wall and then, using magnets, hang artwork or noticeboards. Each disc can be fixed in place using an M4 screw.