The adjustable opening allows the Rosedale cedar garden arbor to accept the cedar gate or cedar seat * The Rosedale cedar arbor is made in the USAfrom western red cedar, a domestic, non-toxic wood with superior durability and resistance to decay * Arrives at your home partially assembled, all necessary hardware and instructions to compete the arbor are included (1 hour assembly time) * Curved and rounded corner braces add rigidity and echo the circle-cut tips of the 2 by 6 headers * This Best Selling garden arbor comes with mounting stakes designed for use with new concrete