A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-454-7749
NSN 6620-01-091-3722
NSN 6320-01-418-2611
NSN 5999-01-142-4490
NSN 6110-01-016-0887
NSN 5945-01-108-2865
NSN 5855-01-651-3794
NSN 5999-01-380-6811
NSN 5996-00-258-4954
NSN 5985-01-528-0795
NSN 5920-00-813-6015
NSN 5965-00-387-6880