A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-01-025-3369
NSN 5950-00-118-9938
NSN 5998-00-683-1333
NSN 6685-00-596-8765
NSN 5945-00-611-7265
NSN 5855-00-252-5743
NSN 5999-01-445-6497
NSN 6620-01-067-8336
NSN 6620-01-107-2965
NSN 6685-01-646-1250
NSN 2925-01-350-8372
NSN 5895-01-310-9033