"The only portable system of its size, the Spalding NBA 60"" Glass The Beast Screw Jack Portable Hoop System gives you the stability of an in-ground, but with a wheeled base that makes it easy to move. The 60"" glass backboard gives you the true rebound you'd find on the professional court. It has a sturdy steel rim that can handle fierce dunks and drives, and you can adjust the height of the rim to anywhere between 7.5 feet and the league-standard 10. This hoop gets its stability from a two-piece 5"" square steel pole. It rests on a 55-gallon base equipped with 4 wheels, so you can move it down the driveway without having to tilt the whole system forward. Dominate the driveway with the Spalding NBA 60"" Glass The Beast Screw Jack Portable Hoop System."