DeWALT D28402 4-1/2" Angle Grinder 10.0 Amp AC/DC 11,000 rpm motor designed for faster material removal and higher overload protection Dust Ejection System provides durability by ejecting dust particles that enter the tool through the air intake vents Jam-pot, low profile gear case provides precise gear alignment for a smoother, quieter transmission while allowing access to tight spaces One piece brush arm prevents brush hang-up due to dust ingress Quick-change wheel release provides easier and quicker wheel removal without the need for a wrench