US SIZE

DIAMETER* (mm)

CIRCUMFERENCE* (mm)

UK SIZE

6

16,5

52

L 1/2

7

17,3

55

N 1/2

8

18,2

57

P 1/2

9

18,9

59

R 1/2

10

19,8

62

T 1/2

11

20,6

65

V 1/2

*Approximately

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