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US/Canadian Standard SizeInside Diameter in millimetersInside Circumference in millimetersInside Diameter in inchesInside Circumference in inches
1 1/212.8540.20.5061.58
213.2641.50.5221.634
2 1/213.6642.70.5381.684
314.07440.5541.739
3 1/214.4845.20.571.788
414.8846.50.5861.836
4 1/215.2947.80.6021.888
515.7490.6181.941
5 1/216.150.20.6341.992
616.5151.50.652.042
6 1/216.9252.80.6662.092
717.32540.6822.146
7 1/217.7355.30.6982.196
818.1356.60.7142.249
8 1/218.5457.80.732.3
918.9559.10.7462.35
9 1/219.3560.30.7622.4
1019.7661.60.7782.463
10 1/220.1762.80.7942.504
1120.5764.10.812.567
11 1/220.98660.8262.608
1221.3967.30.8422.658
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