DEWALT D28144 6-Inch High Performance Small Angle Grinder 13A, AC/DC, 9,000 RPM motor with overload protection Quick change wheel release Keyless adjustable guard Dust ejection system keeps debris from entering air intake Vibration reducing side handle 13.0 Amp/2.3hp, 9,000 rpm DEWALT built G55 (AC) motor designed for faster material removal and higher overload protection Dual clutch protection prevents the gears from stripping and motor from burning up in a wheel p/stall increasing durability 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