A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-151-9816
NSN 6320-00-583-3105
NSN 5990-01-561-0737
NSN 5999-00-222-4808
NSN 5855-00-560-0110
NSN 5990-01-548-5979
NSN 5925-00-140-6367
NSN 7035-00-163-6221
NSN 5910-00-432-0268
NSN 6620-01-352-5640
NSN 2925-01-106-8871
NSN 6240-00-635-9953