inch   mm
1/8   3.175
5/32   3.96875
3/16   4.7625
1/4   6.35
5/16   7.9375
3/8   9.525
7/16   11.1125
1/2   12.7
9/16   14.2875
5/8   15.875
3/4   19.05
7/8   22.225
1”   25.4
1-1/8   28.575
1-1/4   31.75
1-3/8   34.925
1-1/2   38.1
1-5/8   41.275
1-3/4   44.45
1-7/8   47.625
2”   50.8

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