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Colon Tube French Diameter Conversion Scale

(OD = Outer Diameter)

FR mm (OD)
inches (OD)
12 4.0 0.160
14 4.7 0.185
16 5.3 0.210
18 6.0 0.240
20 6.7 0.265
22 7.4 0.295
24 8.0 0.320
26 8.7 0.345
28 9.4 0.375
30 10.0 0.400
32 10.7 0.425
34 11.3 0.455
36 12.0 0.480
38 12.7 0.500
40 13.4 0.530

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