A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-173-0808
NSN 5920-01-062-6209
NSN 5915-01-220-8830
NSN 7035-00-870-0290
NSN 6220-01-394-5263
NSN 5945-00-035-4439
NSN 5950-00-469-3517
NSN 4140-01-602-3175
NSN 5985-01-037-2861
NSN 6320-01-100-7554
NSN 6105-01-089-9143
NSN 2925-00-934-8383