A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-216-1678
NSN 5920-01-218-7859
NSN 6610-01-631-4355
NSN 5835-00-804-0569
NSN 6610-01-212-5545
NSN 2925-01-330-2988
NSN 6610-01-072-0018
NSN 5895-00-413-4535
NSN 6620-01-447-2172
NSN 5985-01-514-2271
NSN 6110-00-596-9124
NSN 5905-01-290-4093