Mechanically, TCO 0719361 designates props (HS 7308.40.00) — "hot dipped galvanised and/or zinc plated, having a rolled thread on the outer tube" — as falling within Part III, Schedule 4 item 50 of the Customs Tariff Act 1995 from 13 Nov 2007 until revoked (s269P; revocation ss269SC/269SD). This affects importers (who claim the tariff concession) and the customs administration (the delegate of the CEO issued the order); it alters tariff treatment for those goods and therefore changes import costs and compliance steps.