A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-00-480-9068
NSN 5835-01-027-0597
NSN 6150-01-425-1947
NSN 5920-01-448-6914
NSN 6110-01-055-0827
NSN 6150-00-875-0739
NSN 4140-01-218-5919
NSN 6610-01-099-0303
NSN 5960-00-034-7925
NSN 5965-01-633-8849
NSN 6650-01-433-1911
NSN 2925-01-055-9705