; the foregoing not presented in kits containing goods described in other subheadings Free No change No change On or before 12/31/2025 . 11981. Wrist watch strap buckles not over 18 mm Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.30.02 Buckles of stainless steel, of a kind used for wrist watch straps measuring not over 18 mm (provided for in subheading 8308.90.60) Free No change No change On or before 12/31/2025 . 11982. Wrist watch strap buckles over 18 mm Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.30.03 Buckles of stainless steel, of a kind used for wrist watch straps measuring over 18 mm (provided for in subheading 8308.90.60) Free No change No change On or before 12/31/2025 . 11983. Used cylinder heads Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.30.04 Used cast-iron cylinder heads designed for use in spark-ignition internal combustion piston engines (provided for in subheading 8409.91.99) 0.8% No change No change On or before 12/31/2025 . 11984. Cylinder heads used solely or principally with certain engines Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.30.05 Cast-iron cylinder heads for use solely or principally with engines of heading 8708, such engines designed to be installed in vehicles classifiable in subheading 8701.20 or 8704.23 and with bore greater than 126 mm (provided for in subheading 8409.99.91) Free No change No change On or before 12/31/2025 . 11985. Engine blocks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.30.06 Engine blocks, each weighing over 272 kg but not over 317 kg, for compression-ignition internal combustion piston engines (diesel or semi-diesel engines), such engines each having a cylinder capacity of approximately 12.4 liters and for vehicles of subheading 8701.20 or 8704.23