DEWALT 7 In. 8, 500 rpm 4.7 HP angle grinder. High power 4.7 HP (maximum motor HP) 8, 500 rpm motor with overload protection provides higher operating speeds under load. Dust ejection system protects the motor from damaging particles entering air intake that would otherwise abrade the motor and increases brush life. Anti-vibe trigger handle reduces user fatigue caused by vibration. Brush door allows for quick brush replacement.