4mm is smaller than 5mm
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25mm2 = 5mm * 5mm
4mm = 4/25.4 in = 40/254 = 20/127 inch.
uh... 5mm. or half a centimeter, .005m or about .197 inches
.5mm is finer than .7 mm
There is no such thing as a USA standard. 4mm is the same length as 0.16 inches, approximately.