7.5 AMP motor design for high output power in a more compact tool (only 3.5 lbs.). All ball bearing design and metal gear housing for durability Labyrinth construction seals and protects the motor and bearings from dust. Large paddle switch for easy operation. Small circumference barrel grip (only 2.5") for added comfort. AC/DC switch for use with alternative power sources. Includes: 4-1/2"