DEWALT D28065 5-Inch/6-Inch High Performance Grinder with Trigger Grip 9,000 rpm DEWALT built G55 (AC/DC) motor designed for faster material removal and higher overload protection Dust ejection system provides durability by ejecting damaging dust and debris particles Quick-change wheel release allows tool free wheel removal Dual abrasion protection provides increased motor protection from damaging dust and debris ingestion One-piece brush arm prevents brush hang-up, vibration-reducing side handle