A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-256-4072
NSN 4140-00-445-3944
NSN 5965-01-240-0233
NSN 5935-01-643-0843
NSN 6645-00-833-2395
NSN 6105-01-228-7317
NSN 5835-01-368-4015
NSN 5975-01-242-0582
NSN 6105-01-476-9116
NSN 4140-01-158-4139
NSN 5905-01-187-1746
NSN 5905-01-313-3890