A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-01-065-9004
NSN 5996-01-034-4694
NSN 6650-01-395-5991
NSN 6220-01-607-6069
NSN 6110-00-583-3373
NSN 5950-01-158-6076
NSN 2925-00-947-9814
NSN 6135-01-336-3115
NSN 5920-00-081-9156
NSN 2925-01-516-0124
NSN 2925-00-149-0760
NSN 5935-00-878-6947