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SIZE CHART

INTERNAL DIAMETER IN MM
EUROPE
USA
UK
15.1
46.7
4.25
H
15.3
48
4.25
I
15.4
48.5
4.75
I 1/2
15.75
49
5
J 1/2
16.1
50.5
5.25
K 1/2 
16.3
51
5.75
L
16.4
51.5
    
16.5
52
6
L 1/2
16.75
52.5
6.25
M
16.9
53
6.5
M 1/2
17.15
53.5
6.75
N
17.3
54
7
N 1/2
17.5
55
7.25
O
17.9
56
7.75
P
18.2
57
8
P 1/2
18.5
58
8.5
Q 1/2
18.8
59
8.75
R
19
59.5
9
R 1/2
19.2
60
9.25
S
20
62.5
  
U
20.2
63
10.5
U 1/2
20.4
64
  
V
20.6
64.5
11
V 1/2