Size Chart

Internal   Diameter (mm) HK EU UK US Size
14.1 6 46 F1/2 3
14.5 7 47 G1/2 3.5
14.9 8 48 H1/2 4
15.3 9 49 I1/2 4.5
15.5 10 50 J -
15.9 11 51 K - SMALL
16.3 12 52 L -
16.5 13 53 L1/2 6 MEDIUM
16.9 14 54 M1/2 6.5
17.3 15 55 N1/2 7
17.5 16 56 O -
17.9 17 57 P -
18.2 18 58 - -
18.8 19 59 R -
19 20 60 R1/2 9
19.4 21 61 S1/2 9.5
19.8 22 62 T1/2 10