A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-253-4050
NSN 5996-01-232-7395
NSN 5925-01-410-8515
NSN 6145-00-238-7050
NSN 5965-01-547-4779
NSN 5930-01-067-3586
NSN 4140-01-397-6138
NSN 5960-01-641-5493
NSN 6320-01-364-1840
NSN 6150-01-478-5108
NSN 5925-01-449-3714
NSN 5835-00-660-4523