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U.S.
METRIC
B/1
2.25mm
C/2
2.75mm
D/3
3.25mm
E/4
3.5mm
F/5
3.75mm
G/6
4mm
7
4.5mm
H/8
5mm
I/9
5.5mm
J/10
6mm
K/10½
6.5mm
L/11
8mm
M/13
9mm
N/15
10mm