A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-327-4090
NSN 6645-01-076-4655
NSN 5985-01-046-4657
NSN 5920-00-911-1662
NSN 7035-01-119-2234
NSN 5855-00-256-5562
NSN 5930-01-025-0882
NSN 6610-01-032-2890
NSN 6220-01-486-3062
NSN 5945-01-101-8843
NSN 4140-01-545-7754
NSN 5915-00-553-8755