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That's exactly what I meant. Thanks for catching my noob error, if it weren't that I'm not hampered by things like decorum and such, I'd be embarrassed.

As I understand it, the razor is measured in 1/8 of an inch. It follows the difference between a 6/8 and a 4/8 is 2/8. 1 inch = 2.54cm; 1/8 inch = 3.2mm, give or take 3micrometers, then 6.4mm would...