This Order declares that “TOOLS, OR TOOL HEADS, MILLING, DOWNHOLE, OIL AND GAS WELL” (classification 8207.70.00) are goods to which item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995 applies, effective 6 Nov 2008; it continues until revoked under ss 269SC or 269SD of the Customs Act (delegate declaration under s269P).
Mechanically this changes tariff treatment for importers of those downhole milling tools; importers and customs must apply the Schedule 4 item when lodging entries, creating a compliance obligation and altering duty payable.