A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-040-6349
NSN 6610-01-122-0064
NSN 2925-01-656-8217
NSN 5855-01-375-2152
NSN 6105-00-166-3817
NSN 5960-01-322-8417
NSN 5999-01-309-3432
NSN 5945-00-087-6489
NSN 5985-01-329-0324
NSN 6320-01-449-0043
NSN 5945-01-371-4138
NSN 6150-01-511-0331