64 thickness, fractional size easy read, hole size and decmial equivalents permanently eched into face conforms to gov't specification gg-g86b
No other part numbers with same form, fit, and function found.
NSN 5999-01-528-6795
NSN 6105-01-085-6002
NSN 5925-01-529-0497
NSN 6145-01-185-3720
NSN 5975-00-190-2319
NSN 6150-00-072-9232
NSN 6105-01-469-6027
NSN 5925-01-246-5464
NSN 6620-01-502-1656
NSN 6110-01-319-3585
NSN 6220-01-202-6689
NSN 5930-00-679-7900