A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-449-1824
NSN 2925-01-327-3069
NSN 6110-01-495-0771
NSN 6620-01-383-7519
NSN 5998-01-386-4682
NSN 6145-00-835-1088
NSN 6320-01-285-1922
NSN 6110-00-557-8315
NSN 5975-01-180-0826
NSN 6110-01-411-7392
NSN 5895-01-416-4831
NSN 6150-01-548-2471