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1/4" translates as 6.25 mm.
8 mm bits dont translate well at all.
1/2" bits are 12.5 mm.
There are 12 mm bits in the world, but so far havent seen any personally.
you need a reasonable quality vernier caliper for woodwork anyway, so buy one and check out what you have.

DO NOT EVER attempt to mix and match any size router bits, injury and possible maiming will occur.
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