A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-249-2900
NSN 5945-01-206-4013
NSN 4140-01-250-2600
NSN 5985-00-910-6617
NSN 5985-01-182-9729
NSN 5935-01-040-3427
NSN 6135-01-086-0809
NSN 6130-01-089-9646
NSN 5990-00-085-4299
NSN 6110-01-466-0582
NSN 5998-00-627-3730
NSN 5925-00-155-2587