A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-157-4637
NSN 6130-00-856-5230
NSN 4140-00-200-9082
NSN 6240-01-348-8975
NSN 6130-01-390-7031
NSN 6150-00-922-1425
NSN 6130-01-451-9934
NSN 5990-01-090-3232
NSN 5985-01-442-7850
NSN 5975-01-171-3207
NSN 5998-01-154-3683
NSN 6105-00-246-5311