Tariff revisions: substitution of customs duty entries across HS chapters under the Finance Act. The schedule amends the First Schedule to the Customs Tariff Act by substituting specified entries in column (4) and, where stated, column (5) against numerous HS sub headings and in many instances across entire chapters, replacing existing tariff table entries with new duty descriptors (including ad valorem rates, instances of 'Free', and specified specific terms), while preserving listed exceptions where indicated.