This Order treats a narrowly described class of imported goods (tariff line 7326.90.90: “balancing columns or dedusters or expansion bins, pneumatic alumina handling or distribution system”) as eligible for a Schedule 4 tariff concession (Item 50). It took effect on 11 Dec 2008 and continues until revoked. It therefore changes customs treatment for importers of those goods by applying the specified Schedule 4 item instead of the ordinary tariff schedule, with revocation and administrative control governed by the Customs Act.