A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-00-735-1799
NSN 6645-01-295-4373
NSN 5895-01-468-6215
NSN 6320-01-211-6578
NSN 5910-00-684-8343
NSN 6610-00-342-9825
NSN 5835-01-651-8807
NSN 5960-01-098-8437
NSN 6110-00-100-4775
NSN 4140-00-099-9205
NSN 2925-00-167-6763
NSN 5950-00-613-2633