A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-01-226-0329
NSN 5998-00-013-1038
NSN 5950-01-427-3723
NSN 6610-00-288-5655
NSN 6620-01-460-9201
NSN 6320-01-648-5538
NSN 5999-01-618-0559
NSN 5998-00-082-8288
NSN 5835-01-132-5894
NSN 6650-01-555-8349
NSN 6105-01-152-2513
NSN 2925-00-471-1128