A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-01-140-4420
NSN 5855-00-149-0766
NSN 5895-00-444-2975
NSN 5920-00-396-1152
NSN 5920-00-715-2541
NSN 6145-01-536-9899
NSN 6110-01-281-7527
NSN 5905-01-026-3772
NSN 5920-01-655-9955
NSN 2925-01-611-2423
NSN 6105-01-500-8265
NSN 6620-01-484-6904