None, since there can be no conversion. A pound is a measure of mass. A millimetre (mm) is a measure of length. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
30 of them
0.3
0.03 decimetres
3mm = 0.12inch.
3mm.
0.3cm = 3mm.
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3mm ~= .11815" closest equivalent drill bit-- 7/64" (slightly undersized @ .109")
3mm = 0.3 cm
3mm is the same as 3 millimeters.
3mm
need to know 3mm into inches