Mechanically, the Order declares that excavator drive sprockets (Customs Tariff classification 8483.90.00) weighing at least 1,100 kg are goods to which Part III, Schedule 4 Item 50 of the Customs Tariff Act 1995 applies, effective 6 Oct 2009 until revoked. Made under s.269P of the Customs Act 1901 by delegate Wendy Knowles, it changes tariff treatment for importers of those sprockets. Importers must ensure the goods meet the description and classification; revocation can occur under ss.269SC or 269SD.