7 CFR § 51.1451 - Metric conversion table.

Inches	Millimeters (mm)
8/16	12.7
7/16	11.1
6/16	9.5
5/16	7.9
4/16	6.4
3/16	4.8
2/16	3.2
6/64	2.4
5/64	2.0
1/16	1.6