A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-426-8989
NSN 5960-01-445-3622
NSN 5975-01-031-7509
NSN 5930-01-552-1357
NSN 5915-01-445-3109
NSN 6645-00-064-9839
NSN 6685-00-536-0476
NSN 5996-01-370-6593
NSN 6240-01-474-6914
NSN 5996-00-802-7822
NSN 5835-01-359-2575
NSN 6145-01-358-4001