A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-01-340-6709
NSN 4140-01-116-8141
NSN 5835-00-876-4544
NSN 5996-00-575-6241
NSN 5910-00-420-3930
NSN 6320-00-422-9006
NSN 2925-00-953-2920
NSN 6650-00-155-5827
NSN 6220-01-089-5505
NSN 6610-01-496-5325
NSN 6150-00-960-3256
NSN 6620-01-210-4403