Milwaukee Electric Tool Corporation makes only one grade of tools--what they call Heavy Duty. All Milwaukee tools are designed for professional use, with demanding performance requirements and long life expectancies in mind. Because Milwaukee's engineers continually visit job sites, they understand the needs of the professional tool user and develop tools to meet the most exacting criteria. Whether it's the cord, the switch, the motor, the bearings, the gears, or the tool's housing, every component of a Milwaukee tool is built tough, built to perform, and built to last--with no exceptions or compromise. That's what Milwaukee means by Heavy Duty.