A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-252-2921
NSN 5935-01-054-4316
NSN 5855-01-231-4945
NSN 5999-01-134-9661
NSN 5999-01-378-3049
NSN 7035-01-546-6386
NSN 5965-01-440-9898
NSN 6620-00-252-6425
NSN 6610-01-415-1623
NSN 6145-00-758-9884
NSN 5855-01-225-5855
NSN 5935-01-445-7812