.4 hp Dynabrade Die Grinders are perfect for use on metal, fiberglass, carbon fiber, composites and more! Dynabrade's .4 hp (298 W) Die Grinders are designed for peak efficiency and longer life! Ideal for rapid material removal, deburring, finishing and polishing, these tools represent the finest in Dynabrade quality and innovation! Integrated Safety-Lock Throttle Lever has a contoured shape for operator comfort, with new dowel-pin that minimizes lever wear. Increased Tool Life due to Unique Pre-Filter that provides extra defense against contaminants in air stream. Governor-Controlled Motor (950 RPM to 30,000 RPM Models) Maintains consistent motor speed under load. Color-coded for easy identification. Ergonomic Oval-Shaped Tool Housing conforms to natural shape of hand for optimum comfort. Lightweight, tool design; each model weighs 0.5 oz (15 g) less than its previous version! 3-Vane Rotor allows wider offering of tool speeds. Achieves stall-torque and horsepower performance equal