A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-180-6997
NSN 5905-00-170-5571
NSN 4140-01-447-6153
NSN 5985-01-364-1108
NSN 5999-00-894-9865
NSN 2925-01-491-6848
NSN 6620-01-217-0559
NSN 6145-01-564-1521
NSN 2925-00-925-0545
NSN 5999-00-752-6879
NSN 5998-00-961-5052
NSN 5999-01-056-4490