sequence the following new heading: 9902.15.08 Cold-formed wire of nickel-titanium alloy, presented in coils, with round cross section, with a diameter of 0.1778 mm or more but not over 0.6350 mm (provided for in subheading 7505.22.10) Free No change No change On or before 12/31/2020 . 1389. Aluminum mountings Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.09 Machined loupe mountings of cast aluminum, with polytetrafluoroethylene coating (provided for in subheading 7616.99.51) Free No change No change On or before 12/31/2020 . 1390. Zinc punches Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.10 Zinc die-cast interior punches, each with a plastic exterior casing (provided for in subheading 7907.00.60) Free No change No change On or before 12/31/2020 . 1391. Sintered tungsten bar Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.11 Sintered tungsten bars containing 99.95 percent or more by weight of tungsten, in 0.004 mm (4 micron) size, each measuring 49.78 cm to 64.14 cm in length, 19.56 cm to 23.5 cm in width and 3.99 cm to 4.11 cm in thickness (provided for in subheading 8101.94.00) Free No change No change On or before 12/31/2020 . 1392. Gallium unwrought in solid form Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.12 Gallium, unwrought and in solid form (provided for in subheading 8112.92.10) Free No change No change On or before 12/31/2020 . 1393. Germanium unwrought in ingot form Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.13 Ingots of germanium, unwrought, each weighing 0.5 kg or more but less than 2 kg (provided for in subheading 8112.92.60). Free No change No change On or before 12/31/2020 . 1394. Germanium purified metal ingots Subchapter II of chapter 99 is amended by inserting in numerical