A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-160-9273
NSN 6110-00-575-9795
NSN 5910-01-520-8561
NSN 5985-01-629-9427
NSN 5985-01-308-6969
NSN 4140-01-602-8454
NSN 5905-01-588-1936
NSN 5990-00-459-5752
NSN 5950-01-300-8838
NSN 5835-00-438-4489
NSN 6150-00-526-3720
NSN 6645-01-185-4061