What frequency would one need to move a metallic object?

Would thickness effect the desired effect? If so how? Can it be controlled? If so how? How can one make a metallic object move without using thrusting technology as we know it? I have studied and hypothisiszed proven and found many different ways to move an object without using thrust and have now seen one of my experiments come to life and one of my theories proven as well. However, the idea of using sound frequency is the one that came to life and I wish to know more about the subject to find if my method had been correct.