When I started magnetizing, I picked up a pack of 2mm magnets. At the time I just had imperial bits for my drill. The set I had included a 5/64th bit, which according to math should be 1.98438mm. Made holes that the magnets would fit snugly in.
Might have trouble finding magnets at that size, but I know you can get drills. Not very easy finding metric drill sets at your local hardware store.
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