Mechanically, this Tariff Concession Order declares that concrete liners made of high‑density polyethylene or polypropylene, with conical anchor studs on one side and thickness between 2.0 and 10.0 mm, are goods to which Item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995 applies (effective 17 March 2006; made under s.269P of the Customs Act 1901). Practically, eligible importers can claim the Schedule 4 tariff treatment for those specific products; the delegate may revoke the Order under ss.269SC/269SD.