A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-759-3962
NSN 6650-01-633-2430
NSN 6145-01-642-5017
NSN 6150-01-431-8617
NSN 5975-01-529-8221
NSN 5855-01-020-7982
NSN 5985-01-327-3017
NSN 6145-01-249-4329
NSN 6650-01-207-2905
NSN 5855-00-149-0766
NSN 5960-01-548-4896
NSN 5975-00-477-4479