The tariff classification of concrete expansion joints from China. The item under consideration is identified in your letter as the Finn Joint. The Finn Joint is described as a concrete expansion joint that is used in the construction of concrete slabs. Each joint in question consists of an aluminum extrusion, a rubber gate seal and nylon fixing tabs. The expansion joint allows concrete slabs to shrink during curing without cracking, and services expansion and contracting due to temperature changes.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N223518