A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-561-7802
NSN 6130-00-437-4921
NSN 5930-01-332-0682
NSN 4140-00-928-9097
NSN 6105-00-964-4060
NSN 6145-00-382-6199
NSN 5960-00-844-9840
NSN 4140-01-445-5945
NSN 5930-01-590-1370
NSN 6620-00-140-1850
NSN 5975-01-512-2038
NSN 5950-01-521-2083