A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-01-451-7412
NSN 6145-00-181-9622
NSN 6105-00-367-1984
NSN 5930-00-600-2328
NSN 5925-01-411-7839
NSN 5960-01-203-9814
NSN 5930-01-180-4019
NSN 4140-00-078-9357
NSN 5925-01-587-4682
NSN 5930-01-026-6370
NSN 6150-01-098-8477
NSN 6620-01-281-6386