This Tariff Concession Order applies Part III, Schedule 4 item 50 of the Customs Tariff Act 1995 to imported polypropylene geogrids (tariff classification 3926.90.90) having a tensile strength of not less than 20 kN/m. It takes effect on 10 May 2006 and continues until revoked under the Customs Act. It affects importers and customs administrators by changing the tariff treatment of those specific geogrids; to determine the actual duty treatment you must read the referenced Schedule 4 item and the Customs Act.