The Carlyle Tools 1/4" Variable Air Die Grinder, No. CPTDG14, is powered by a 1/3 HP motor, designed to deliver reliable performance. Its built-in regulator and safety throttle provide positive speed control for maximum accuracy. The ball-bearing construction offers smooth operation, and the rear exhaust keeps airflow away from the user's work area. A compact, 90-degree head allows users to reach tight, restricted spaces.