High power 4 HP (maximum motor HP) 8,500 rpm motor with overload protection provides higher operating speeds under load. Epoxy coated field and armature provide long service life against abrasion from airborne debris. Low-profile gearcase allows for work in tight areas. Automatic turn-off brushes shut down the tool when brushes need to be changed to avoid tool damage. 2-position side handle provides improved ergonomics for specific applications. 8,500 rpm provides optimal material removal with 7" grinding wheels. Brush window allows for quick brush replacement.