A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-158-9412
NSN 5925-01-468-7146
NSN 6320-00-116-3658
NSN 5945-00-727-8778
NSN 5990-00-050-6854
NSN 5910-01-119-4360
NSN 5935-01-398-0688
NSN 5950-01-038-7968
NSN 6105-01-512-1831
NSN 5998-01-323-6425
NSN 5930-00-914-0066
NSN 6145-01-392-1116