The Wizard IV is the top-of-the-line glass grinder and a best-seller for professionals and serious glass hobbyists because of its power and features. The workhorse 40 oz-in torque motor provides plenty of power to do the jobs you want. This grinder comes with TWO different sized grinding bits that you can use at the same time, eliminating removing/replacing different sized grinding bits. The Wizard IV also includes a FaceShield and a SecondStory work surface.