DEWALT DW849 8 Amp 7-Inch/9-Inch Electronic Variable-Speed Right-Angle Polisher Powerful, 8.0 Amp, all ball-bearing construction for long life Electronic module maintains specified speed even under load Conveniently-located variable speed dial lets user set maximum speed from 1,000 to 3,000 for different materials and applications variable speed trigger allows user to instantly control speed from 0 to dialed setting Heat-treated, precision-cut gears for smooth operation; External brush caps for easy servicing