A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-364-6830
NSN 6130-01-576-2664
NSN 5985-01-391-7458
NSN 5905-01-557-2981
NSN 6105-01-482-6301
NSN 6610-00-477-7931
NSN 5895-01-025-0971
NSN 5915-01-293-9966
NSN 5960-00-567-2380
NSN 6610-01-123-7292
NSN 2925-01-121-3355
NSN 5999-01-619-4368