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    Inside Inside Inside Inside Number Sizes Wheat Sheaf 　 　
    Diameter Diameter Circumference Circumference US/Canada British Japanese Swiss
    (inches) (mm) (inches) (mm) Standard Irish Equivalent Equivalent
    　 　 　 　 　 Australian 　 　
    　 　 　 　 　 Equivalent 　 　
    0.458 11.6 1.438 36.5 0 　 　 　
    0.466 11.8 1.463 37.2 1/4 　 　 　
    0.474 12 1.488 37.8 1/2 A 　 　
    0.482 12.2 1.513 38.4 3/4 A 1/2 　 　
    0.49 12.4 1.539 39.1 1 B 1 　
    0.498 12.6 1.564 39.7 1 1/4 B 1/2 　 　
    0.506 12.9 1.589 40.4 1 1/2 C 　 　
    0.514 13.1 1.614 41 1 3/4 C 1/2 　 　
    0.522 13.3 1.639 41.6 2 D 2 1.5
    0.53 13.5 1.664 42.3 2 1/4 D 1/2 　 　
    0.538 13.7 1.689 42.9 2 1/2 E 3 2.75
    0.546 13.9 1.714 43.5 2 3/4 E 1/2 　 　
    0.554 14.1 1.74 44.2 3 F 4 4
    0.562 14.3 1.765 44.8 3 1/4 F 1/2 5 5.25
    0.57 14.5 1.79 45.5 3 1/2 G 　 　
    0.578 14.7 1.815 46.1 3 3/4 G 1/2 6 6.5
    0.586 14.9 1.84 46.7 4 H 7 　
    0.594 15.1 1.865 47.4 4 1/4 H 1/2 　 7.75
    0.602 15.3 1.89 48 4 1/2 I 8 　
    0.61 15.5 1.915 48.7 4 3/4 J 　 9
    0.618 15.7 1.941 49.3 5 J 1/2 9 　
    0.626 15.9 1.966 49.9 5 1/4 K 　 10
    0.634 16.1 1.991 50.6 5 1/2 K 1/2 10 　
    0.642 16.3 2.016 51.2 5 3/4 L 　 11.75
    0.65 16.5 2.041 51.8 6 L 1/2 11 12.75
    0.658 16.7 2.066 52.5 6 1/4 M 12 　
    0.666 16.9 2.091 53.1 6 1/2 M 1/2 13 14
    0.674 17.1 2.116 53.8 6 3/4 N 　 　
    0.682 17.3 2.141 54.4 7 N 1/2 14 15.25
    0.69 17.5 2.167 55 7 1/4 O 　 　
    0.698 17.7 2.192 55.7 7 1/2 O 1/2 15 16.5
    0.706 17.9 2.217 56.3 7 3/4 P 　 　
    0.714 18.1 2.242 56.9 8 P 1/2 16 17.75
    0.722 18.3 2.267 57.6 8 1/4 Q 　 　
    0.73 18.5 2.292 58.2 8 1/2 Q 1/2 17 　
    0.738 18.7 2.317 58.9 8 3/4 R 　 19
    0.746 18.9 2.342 59.5 9 R 1/2 18 　
    0.754 19.2 2.368 60.1 9 1/4 S 　 20.25
    0.762 19.4 2.393 60.8 9 1/2 S 1/2 19 　
    0.77 19.6 2.418 61.4 9 3/4 T 　 21.5
    0.778 19.8 2.443 62.1 10 T 1/2 20 　
    0.786 20 2.468 62.7 10 1/4 U 21 　
    0.794 20.2 2.493 63.3 10 1/2 U 1/2 22 22.75
    0.802 20.4 2.518 64 10 3/4 V 　 　
    0.81 20.6 2.543 64.6 11 V 1/2 23 　
    0.818 20.8 2.569 65.2 11 1/4 W 　 25
    0.826 21 2.594 65.9 11 1/2 W 1/2 24 　
    0.834 21.2 2.619 66.5 11 3/4 X 　 　
    0.842 21.4 2.644 67.2 12 X 1/2 25 27.5
    0.85 21.6 2.669 67.8 12 1/4 Y 　 　
    0.858 21.8 2.694 68.4 12 1/2 Z 26 28.75
    0.866 22 2.719 69.1 12 3/4 Z 1/2 　 　
    0.874 22.2 2.744 69.7 13 　 27 　
    0.882 22.4 2.769 70.3 13 1/4 Z1 　 　
    0.89 22.6 2.795 71 13 1/2 　 　 　
    0.898 22.8 2.82 71.6 13 3/4 Z2 　 　
    0.906 23 2.845 72.3 14 Z3 　 　
    0.914 23.2 2.87 72.9 14 1/4 　 　 　
    0.922 23.4 2.895 73.5 14 1/2 Z4 　 　
    0.93 23.6 2.92 74.2 14 3/4 　 　 　
    0.938 23.8 2.945 74.8 15 　 　 　
    0.946 24 2.97 75.4 15 1/4 　 　 　
    0.954 24.2 2.996 76.1 15 1/2 　 　 　
    0.962 24.4 3.021 76.7 15 3/4 　 　 　
    0.97 24.6 3.046 77.4 16 　 　 　
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