A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-592-2557
NSN 5999-01-239-4620
NSN 6105-01-441-5509
NSN 6650-01-580-4321
NSN 4140-01-089-9724
NSN 6240-01-069-2688
NSN 4140-01-649-2817
NSN 6650-00-193-7358
NSN 6240-01-281-1232
NSN 6145-01-051-3343
NSN 5935-00-547-4626
NSN 5920-01-196-4614