Upgraded and redeveloped to an even higher specification, the Sure Shot 521 is a portable, heavy-duty basketball unit designed for schools, colleges and leisure centres. The unit features a larger and stronger UV and weather-resistant backboard made with fibreglass composite. The 521 can be easily moved around using the mounted wheels, and it can be filled either with 130 litres of water or 210kg (463lbs) of sand to ensure proper ballast, stability and support. The height can be comfortably adjusted up to the official standard 10ft with the U-just system. The Sure Shot 521 is very easy to assemble, and it has been approved by Basketball England. A thicker square pole makes it rock-solid and durable, whilst the base is reinforced with a steel frame doe increased strength.