A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-053-9568
NSN 5975-01-055-7761
NSN 6135-00-182-7008
NSN 2925-01-587-3956
NSN 5835-00-401-2578
NSN 5965-00-230-8818
NSN 6105-01-573-7488
NSN 5925-01-571-3129
NSN 6240-01-530-0438
NSN 5925-01-014-7183
NSN 6650-01-227-9634
NSN 6130-01-123-9041