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Italian size
French size
American size
English size
Circumference in cm
1
41
B
4.08
2
41.50
D
4.18
42
2.50
42.75
2.5
E
4.24
3
43
4.27
4
44
F
4.40
5
45
4.49
5.50
45.50
3.5
G
4.55
6
46
H
4.58
6.75
46.75
H-1/2
4.62
7
47
I
4.68
8
48
4.5
I-1/2
4.80
9
49
J
4.90
9.50
49.25
J-1/2
4.96
10
50
K
5.02
10.5
50.50
5.5
L
5.06
11
51
L-1/2
5.09
11.5
51.50
M
5.12
12
52
5.18
12.5
52.5
5.21
13
53
6.5
N
5.28
13.5
53.50
5.34
14
54
5.40
14.5
54.50
O
5.43
15
55
5.46
15.5
55.50
5.53
16
56
7.5
P
5.59
16.5
56.50
5.65
17
57
Q
5.68
17.5
57.50
