A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-00-532-1112
NSN 6220-01-351-6686
NSN 5999-00-902-0721
NSN 6320-01-516-3836
NSN 5998-01-471-6554
NSN 5950-00-645-4734
NSN 6105-00-174-8245
NSN 6220-01-491-5863
NSN 6610-00-611-1341
NSN 5945-00-299-8295
NSN 5996-00-843-4463
NSN 6105-01-110-0264