A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-782-4624
NSN 6135-01-613-1155
NSN 5835-00-351-9459
NSN 6650-00-983-6722
NSN 6320-00-476-6898
NSN 7035-01-287-9817
NSN 5930-01-364-8401
NSN 5996-00-646-7708
NSN 5965-00-313-9049
NSN 6135-01-633-8502
NSN 5835-01-053-3152
NSN 6150-01-468-6745