CHANGE THE WAY YOU GAME WITH THE LIFETIME MAMMOTH IN-GROUND BASKETBALL SYSTEM. The Lifetime Mammoth In-Ground Basketball System is a strong, durable in-ground system that features a weather-resistant, steel frame, glass backboard for optimum rebounding. The Mammoth pump height adjustment mechanism easily adjusts from 7.5 to 10 ft. high in infinite height increments. The system also features a heavy-duty Spring-Flex Rim with a wrap-around steel brace, and includes a heavy-duty nylon net. The bolt-down bottom makes for easy removal when necessary.