This Order treats a narrowly described imported product — steel line pipe that is longitudinally welded and at least 645 mm in diameter — as eligible for the tariff concession listed in Part III of Schedule 4 to the Customs Tariff Act 1995, effective 23 April 2007 until revoked. It affects importers (who face the tariff outcome set by that Schedule item) and the customs agency (which must classify, apply and may later revoke the concession). The measure changes the price incentive to import the specified pipe and creates a compliance check against the physical description.