A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-068-3536
NSN 5935-00-610-6116
NSN 6650-01-643-5908
NSN 6645-00-262-7448
NSN 5895-01-465-5323
NSN 6620-01-535-6925
NSN 6110-00-049-5063
NSN 5915-00-226-6863
NSN 5965-01-073-9081
NSN 5950-01-331-6403
NSN 5920-01-471-9235
NSN 5910-01-479-2860