A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-250-3687
NSN 5835-01-378-6804
NSN 5930-01-374-0700
NSN 5965-00-439-6287
NSN 5945-00-019-7550
NSN 4140-01-381-0099
NSN 6610-01-468-0679
NSN 6685-00-186-9190
NSN 6320-00-676-9387
NSN 2925-01-535-7235
NSN 5905-01-501-6178
NSN 6620-01-167-0881