A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-580-4760
NSN 5945-01-477-5531
NSN 6150-01-587-1894
NSN 5935-01-596-8595
NSN 5920-01-318-5316
NSN 5960-01-146-0289
NSN 6150-01-181-4530
NSN 6150-01-650-2499
NSN 6105-01-163-7655
NSN 5965-00-876-2378
NSN 6320-00-238-9973
NSN 6150-01-423-7763