The 14' tunnels steel bows, lift kit, ground post, solid center purlin, and wind bracing are all 1 3/8” (3.49cm) in diameter and 17 gauge steel. 

The 16' tunnels solid center purlin and wind bracing are all 1 3/8” (3.49cm) in diameter and 17 gauge steel. The steel bows, lift kit, and ground post are 1 3/8" in diameter and 14 gauge steel.