The Bison 4'' Quick Change™ Residential Basketball System is adjustable and so durable you can slam dunk! Hard work and dedication pay off on the court and in the design and manufacture of quality equipment as well. Bison’s 4" square Qwik Change™ poles have 75% more steel than common round poles. One of these systems is going to look great in your driveway for years to come! It’s going to grow with your kids, too. Height adjusts from 7½' to 10' in 6" increments. The height adjustment mechanism has over ten times the pivot contact area of commonly compared round pole systems, so go ahead and let them slam dunk! The mounting design for the pro-style flexible goal transfers playing stress to the pole, protecting the backboard.