A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-633-6201
NSN 7035-00-946-2642
NSN 5905-01-328-9003
NSN 5920-01-141-6885
NSN 2925-01-265-2853
NSN 5999-00-036-3713
NSN 7035-01-350-4247
NSN 5915-01-463-3347
NSN 6150-00-616-7717
NSN 6110-01-489-0543
NSN 6610-01-613-8805
NSN 5835-01-068-4214