Air Turbine Spindles® maintain high speed and torque under load using a patented turbine governor. At governed 25,000 - 90,000 rpm to 1.40 hp (1.04 kW), these powerful spindles have only 2 moving parts – patented turbines and ceramic bearings cooled by airflow. The result is low vibration, low heat and no thermal expansion and great reliability, unlike gear driven speeders.