A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-060-8300
NSN 6645-01-215-3629
NSN 5895-00-805-8137
NSN 6150-01-475-4536
NSN 5910-01-319-2431
NSN 5910-00-337-8292
NSN 5998-01-485-3377
NSN 5855-01-334-6594
NSN 6650-01-062-0828
NSN 6240-01-088-7629
NSN 5855-01-171-6945
NSN 5945-00-106-1302