1/2 in. x 3-1/2 in. x 10 ft. Expansion Joint 10 PC

This is 10 pieces of 1/2 in. x 3-1/2 in. x 10 ft. Expansion Joint. Expansion joints are put in place before the concrete is poured, and is usually left in place for the life of the slab. The Expansion joint might be put in place where one slab meets another, or a slab meets a building. The Expansion joint should sit below the poured concrete.