The Height Rider 21 4×4 (HR21 4×4) self propelled boom lift combines innovative weight and space saving design with an excellent turning circle for better maneuverability on-site and lower transportation costs. The HR21 4×4 self propelled boom lift version delivers superb traction through its unique suspension and powerful motors. The HR21 4×4 self propelled boom lift offers exceptional outreach, whether it be up-and-over access to awkward locations or outreach to jobs below ground level. Proportional controls deliver smooth, measured operation while platform rotation and fly-boom allow precise positioning anywhere in the HR21 4×4 self propelled boom lift & 39;s vast working envelope. The HR21 4×4 self propelled boom lift does it all still leaving plenty of space in the platform for tools and equipment.