A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-01-391-5148
NSN 5960-01-170-4057
NSN 5920-01-579-3193
NSN 5990-00-179-2576
NSN 6220-00-218-0857
NSN 5985-00-582-5770
NSN 7035-01-568-9555
NSN 7035-00-295-0451
NSN 5910-01-037-6850
NSN 5930-01-041-5566
NSN 5965-01-493-4060
NSN 5998-01-112-3974