A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-011-0264
NSN 5835-01-310-8979
NSN 4140-01-535-6477
NSN 6610-01-100-3662
NSN 5925-01-491-2982
NSN 5855-01-260-7445
NSN 6220-01-190-8605
NSN 5920-01-552-8792
NSN 6610-00-974-6607
NSN 6610-01-050-3075
NSN 5920-00-711-0767
NSN 5930-01-429-0144