DEWALT D28115N 4-1/2-Inch/5-Inch High Performance Grinder with No-Lock On Trigger Grip 13.0 Amp/2.3hp, 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 that enter the tool through the air intake vents 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 due to dust ingestion; Vibration-reducing side handle increases comfort for extended use applications