5",Random Orbit Sander, Provides Maximum Sanding Speed For Smooth Finishes, Controlled Finishing System Maintains Controllable Pad Speed & Minimizes Gouging During Start Up, Dual Plane Counter Balanced Fan Reduces User Fatigue, Dust-SealedSwitch Protects Against Dust Ingestion For Longer Switch Life, Sealed 100% Ball Bearing Construction, Accepts 5", 8 Hole Hook & Loop Paper.