Bosch 1810PS 4-1/2-Inch Paddle Switch Grinder with Lock-On Switch 2-position vibration control side handle reduces vibration up 60 percent for increased comfort and less fatigue Unique directed airflow design diverts dust away from switch and vital components Epoxy coated field windings provide ultimate protection against abrasive dust and debris Sealed switch keeps debris out of the switch mechanism and extends switch life ServiceMinder brushes eliminate guesswork and stop the tool when preventative maintenance is required