A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-00-189-2762
NSN 6220-00-276-8681
NSN 5910-00-968-0387
NSN 5985-00-636-8689
NSN 5895-00-390-7806
NSN 6145-00-134-3729
NSN 6620-00-527-6523
NSN 5998-01-652-9166
NSN 5930-00-930-1574
NSN 5960-01-399-4327
NSN 6150-00-422-1254
NSN 6130-01-573-7665