A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-00-886-9771
NSN 4140-01-108-9084
NSN 6110-00-631-7196
NSN 5925-01-413-4807
NSN 5925-01-185-1390
NSN 5835-01-067-9271
NSN 6240-01-210-1927
NSN 5835-00-698-9824
NSN 5930-01-567-6066
NSN 5925-00-068-0740
NSN 6105-01-245-8204
NSN 6130-01-127-6266