The D28114 4-1/2"(115mm) / 5"(125mm) High Performance Cut-Off/Grinder with E-Clutch® shuts the grinder off when a wheel pinch or wheel stall occurs, extending the life of the gears and motor. Dust Ejection System™ technology clears dust and debris for extra protection. Power tool shuts off before overheating with Power-Off®Advanced Overload Protection