This Order (declared under s.269P of the Customs Act 1901) says that crawler‑mounted excavators with 360° slewing and a digging depth not greater than 6 metres (tariff classification 8429.52.90) qualify for the tariff concession at Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995, effective 3 June 2005. Importers of those specific machines pay the lower duty treatment while the concession remains in force; it can be revoked under ss.269SC or 269SD, and requires correct classification and matching the listed description.