Dust Ejection System protects from abrasion damage increasing the life of the tool. Contributes to long motor life. Overload protection prevents the motor from overheating by shutting off the unit until it cools down. Soft start reduces kick back. Torque limiting clutch reduces the maximum torque reaction transmitted to the operator. Rubber grip rear handle provides the user with greater comfort during operation. No volt release switch prevents the unit starting when plugged in; even if the switch is lock on. Switch must consciously be reset before power is delivered. Anti-vibration side handle provides the user with greater comfort during operation. Brush window allows quick brush replacement. Quick adjustment tool free guard.