7007.21
Of size and shape suitable for incorporation in vehicles, aircraft, spacecraft or vessels:
Duty rates
“General” applies to imports from most trading partners under normal trade relations. “Special” lists products eligible for reduced or duty-free treatment under programs like GSP, USMCA, CAFTA-DR, or individual free-trade agreements. “Column 2” applies to imports from countries without normal trade relations (currently Cuba and North Korea).
Chapter 70
Glass and glassware (Section XIII — Articles of stone, ceramic, glass)