DEWALT D28131 4-1/2-Inch/5-Inch High Performance Angle Grinder 13.0 Amp/2.3hp, 11,000 rpm DEWALT built G55 (AC) 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 Complete Electronic Control provides multiple advanced technology features such as E-Clutch, Power-Off, and Power-Loss Reset 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