A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-208-3390
NSN 2925-01-432-6520
NSN 6105-01-415-5555
NSN 5998-01-604-8945
NSN 6130-01-466-8880
NSN 5998-00-944-1832
NSN 5985-01-265-8416
NSN 5960-01-408-8263
NSN 5915-01-330-2846
NSN 5905-01-429-0372
NSN 6240-01-026-1376
NSN 6220-01-516-1292