Magnet Holders 3mm x 1mm 3mm x 2mm 4mm x 2mm
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Magnet Holders 3mm x 1mm, 3mm x 2mm, 4mm x 2mm

Press fit 3x1 3x2 or 4x2 mm magnets into holders which are easy to super glue to bases for storage ...

similar models —

Magnet Holders 3mm x 1mm, 3mm x 2mm, 4mm x 2mm alternatives
Magnet holder
perja12