A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-439-4479
NSN 5950-01-116-4155
NSN 5999-01-301-1780
NSN 5895-01-123-8694
NSN 6145-00-782-0181
NSN 6135-01-014-9755
NSN 5945-00-081-9491
NSN 6145-01-126-9750
NSN 6240-01-076-1793
NSN 5998-01-415-5163
NSN 5905-01-181-5570
NSN 5998-00-284-1090