This Tariff Concession Order applies a Schedule 4 tariff concession (item 50) to a narrow class of imported brass bars (Customs heading 7407.21.00) from 21 September 2005 until revoked. It covers round or hexagonal brass bars that meet a dezincification limit measured under ISO 6509. Importers of those brass bars are affected: the order changes the tariff treatment available to them. A delegate of the Chief Executive Officer issued the order and Customs may revoke it under sections 269SC or 269SD, so importers must hold evidence the goods meet the ISO requirement.