4mm in dollars is simply four million dollars. M is used to symbolize three zeros in Roman numerals so the two Ms will be six zeros which is a million so 4mm is four million dollars.
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4mm is smaller than 5mm
4mm = 4/25.4 in = 40/254 = 20/127 inch.
There is no such thing as a USA standard. 4mm is the same length as 0.16 inches, approximately.
9.4cm
0.7 cm