A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-00-560-0110
NSN 5945-01-191-9166
NSN 5895-01-448-3037
NSN 5998-01-027-1809
NSN 5920-01-243-0611
NSN 6685-01-598-0100
NSN 5905-01-067-4254
NSN 5925-01-252-6046
NSN 6220-01-104-9033
NSN 6130-01-175-7056
NSN 6220-00-049-7834
NSN 5905-01-551-1724