A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-116-9368
NSN 6620-00-951-0153
NSN 6150-01-093-0632
NSN 6105-00-189-0515
NSN 5990-01-506-7695
NSN 6130-01-356-6909
NSN 5950-01-610-2556
NSN 6620-00-394-1812
NSN 5990-01-097-4721
NSN 5945-01-220-9923
NSN 5990-00-605-0391
NSN 6240-01-400-4212