A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-379-9742
NSN 6110-01-152-7050
NSN 5915-00-992-6406
NSN 7035-00-981-7216
NSN 5985-01-406-5927
NSN 6685-00-293-5262
NSN 6240-01-545-2990
NSN 6105-00-901-0673
NSN 6645-00-720-3953
NSN 5999-00-954-6534
NSN 6135-00-078-9931
NSN 5920-00-476-9956