A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-473-1711
NSN 6105-01-555-7874
NSN 6240-01-461-4429
NSN 6220-00-229-4704
NSN 5965-01-195-2168
NSN 5930-01-630-5748
NSN 5960-01-370-4285
NSN 6320-01-652-3806
NSN
NSN 6135-00-477-8847
NSN 6320-01-176-8367
NSN 5835-01-366-5907