12.7 millimetres
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2 and a half mm
approximately 12.7 mm
12.7 mm Direct Conversion Formula 0.5 in* 25.4 mm 1 in = 12.7 mm
That depends on what you call "close". 3 mm is certainly closer to 1/2 inch than it is to a mile. 1/2 inch is about 12.7 mm.
1 mm = 0.03937008 inches, so 1/2 inch is bigger