Work on your game right in your own driveway with this Spalding NBA 54" acrylic screw jack portable basketball system. The system features a steel pole and board frame for long-lasting durability. Perfect for any size player, the easy-to-use Screw Jack lift system allows for easy height adjustment. Rim: Arena Slam Rim--A heavy-duty solid steel rim with ultra-smooth spring action that is designed to flex when pressure is applied, helping to relieve stress from the backboard during game play. The Arena Slam rim features institutional-style wrap steel support braces and steel rams that maximize durability and rim support. A steel box cover encloses all of breakaway rim components, optimizing aesthetics and safety. Pole Shape: Round--Standard pole Height Adjustment System: Screw Jack Lift System--Provides infinite height adjustment from 7.5 to 10 feet.