1-1/2 in. x 3/8 in. x 1/2 in. x 10 ft. Z Bar

1-1/2 in. x 3/8 in. x 1/2 in. x 10 ft. Z Bar is used to protect the horizontal joints between sheets of siding from water infiltration. The large leg of the metal goes against the wall, leaving the seat and face covering the top edge of the siding.