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32, 64, 128 etc. are all round numbers, counting in binary. They are powers of two. Since computers work in binary, they make logical sense.
1220mm is 4ft, and 18 and 25mm are three-quarters of an inch, and an inch respectively.
They were making a joke. That being said, im not familiar with lumber or imperial<->metric conversions so their second point was lost on me, so thanks.