A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-091-4241
NSN 5905-00-166-8780
NSN 7035-00-535-8109
NSN 2925-01-556-0333
NSN 6320-00-284-1524
NSN 6110-01-053-1755
NSN 6150-01-132-0001
NSN 5935-01-657-5581
NSN 5835-01-399-5820
NSN 6135-00-377-9165
NSN 5895-01-525-8640
NSN 6105-01-432-1342