The Springfield Arbor is a graceful arched curve distinguishes this modestly priced version from its larger cousin, the Nantucket. Made from durable vinyl, easy to install (with pre-assembled side panels) and includes a 15 year warranty. Posts are 66 inches. There is no in-ground allowance; posts are actually flush with the ground. We suggest using the 3.5" Aussie Augers(ULAussie) for securing in the ground. Inside opening: 81"H x 31"W x 30"D) 56 lbs.