A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-236-2510
NSN 5905-01-491-7600
NSN 5945-01-429-9824
NSN 5999-01-585-4505
NSN 6320-01-029-2196
NSN 5999-00-469-6762
NSN 6105-00-442-1818
NSN 5905-00-884-4779
NSN 6130-01-483-0814
NSN 5895-01-566-7709
NSN 6110-01-656-7770
NSN 6650-01-321-2905