This Tariff Concession Order applies Schedule 4 Item 50 to a specific imported good: modular bottom-hole stabilisers for oil and gas wells (customs classification 8431.43.00) with power/communication ring connections at both ends and a connecting wireway. Importers of those stabilisers receive the tariff concession (reducing customs duty). The declaration was made by a delegate of the Chief Executive Officer, takes effect from 5 November 2008, and remains until revoked under sections 269SC or 269SD, which gives the agency administrative discretion and may affect sourcing and pricing decisions.