This Tariff Concession Order (TCO 0510523) declares that specified synchrotron parts — YAG (yttrium aluminium garnet) screens and Faraday cups, classified at 8543.90.90 — are covered by an item in Part III of Schedule 4 to the Customs Tariff Act 1995, altering their tariff treatment. It took effect on 11 August 2005 and continues until revoked under sections 269SC or 269SD of the Customs Act 1901. Mechanically, the delegate (under s.269P) authorises the concession, which reduces import duty for eligible importers and requires correct classification and recordkeeping to claim it.