20’ – Installed height is 20’. It is rated for 95 mph winds. The base is 3.0” in diameter, with a 12- gauge wall thickness. It is a 4-section pole (3 joints). The pole comes with a premium 4’x6’ Nylon US Flag. 20’LT - Installed height is 18.5’. It is rated for 75 mph winds. The base is 2.5” in diameter, with a 14- gauge wall thickness. It is a 3-section pole (2 joints). The pole comes with a premium 3’x5’ Nylon US Flag. The LT is an abbreviation for light duty.