Mechanically, this Order applies item 50 of Part III of Schedule 4 of the Customs Tariff Act 1995 to goods described as “plugs, isolation, tubing, oil and gas well” classified at tariff heading 8479.89.90, effective 2 April 2009 until revoked. It affects importers of those goods (who will face the altered tariff treatment), customs revenue, and any domestic businesses competing with imports. The decision was made by a delegate of the CEO under s.269P; compliance requires correct tariff classification and reliance on the concession while it remains in force.