Built with high-quality steel material, this pneumatic tool features excellent rust resistance and great toughness for long-lasting and reliable performance. It works with an air power system, requiring no disassembly of CV joints when replacing rubber boots and greatly simplifying maintenance steps. Designed to operate under 5-8bar working pressure and fits joint diameters ranging from 20mm to 120mm, offering wide compatibility for various ball cages. Easy to operate, just lubricate the boot, position it on the expander and turn on the air valve to finish installation quickly and efficiently. Specially made for rubber CV boots and steering boots, please note it is not applicable for PVC plastic boots in daily use.