A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-314-7916
NSN 6610-00-971-4881
NSN 5999-01-501-5783
NSN 5855-01-459-4348
NSN 6150-01-294-9222
NSN 6135-01-449-2144
NSN 6240-01-466-4718
NSN 6220-01-072-9997
NSN 6650-00-161-4122
NSN 6610-01-013-8922
NSN 6220-01-266-2341
NSN 6220-01-313-0094