The USA 5 cents (nickel) coin is ø 21.21 mm
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There are ten millimetres in one centimetre, so 220 mm = 22 cm.
It is: 44.3 mm Check: 44.3+44.3+15.1+15.1 = 118.8 mm
ø 21.21 mm 2.121 cm
21.21 mm (0.835 in) except Shield nickels (1866-1883) 20.5 mm (0.807 in)
There are different sizes: commonly around 7 mm.