11 Amp AC/DC motor is built to deliver 11,000 rpm and remove material fast. Dust Ejection System ejects damaging dust and debris particles that enter the tool and over-sized brushes provide 2 times the brush life of the previous model. One-Touch™ guard allows for 360-degree rotation of the guard with a single action and Quick-Change™ wheel release allows tool-free wheel removal without need for a wrench. Auto-off brushes shut the tool down when the brushes need replacing to avoid tool damage and paddle switch with safety lock-off prevents accidental start up.