A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-00-243-7782
NSN 5910-01-038-6628
NSN 6105-01-142-6179
NSN 5945-00-089-2748
NSN 6620-01-621-0719
NSN 6685-01-292-1199
NSN 5990-01-116-2181
NSN 5998-01-373-0867
NSN 5930-01-165-7156
NSN 5925-01-093-7558
NSN 6145-01-379-8662
NSN 5835-00-466-3075