I did not see the frequency question So the speed is higher than stated. If low speed is important, look elsewhere. The rest of the tool works flawlessly. However, there is a big problem. cable length. The cable length from the motor to the controller is only 5 feet. My bench is 38 inches tall and the hanger is another 42 inches tall, so I need 80 inches just to reach the floor and I really need more to position the controller. Buy 6 feet. 3 pin extension. The cord from the controller is only 4 feet long and doesn't reach an outlet on my bench. An extension cable is also required here. You would think such a tool would come with 15ft cords.