A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-01-400-4194
NSN 5950-00-276-8584
NSN 5998-01-507-1624
NSN 5945-00-443-4239
NSN 6650-01-498-9695
NSN 6150-01-014-5416
NSN 5895-01-599-2833
NSN 6150-01-529-6815
NSN 6645-00-936-9111
NSN 6110-01-541-3827
NSN 6610-01-527-8006
NSN 4140-01-106-4755