Cuts holes 1″, 1-1/4″, 1-1/2″, 1-3/4″, 2″, 2-1/4″, and 2-1/2″ thru wood, metal, pressed wood or plastics up to 1-3/4″ thick. Perfect circle blades are made of electric furnace steel. Automatic slug ejector prevents clogging. Built-in blade selector on housing fits any electric drill, lathe, or drill press.