The DWP849X 7" / 9" Variable Speed Polisher with Soft Start has a powerful 12 Amp motor with ball bearing construction and electronic control to deliver desired finish results. Variable speed trigger allows user to control speed from 0 to dialed maximum setting.; Powerful, 12 amp, all ball-bearing construction for long life and performance for the most demanding applications; Electronic module maintains specified speed under load delivering better finish results; Conveniently located variable speed dial lets user set maximum speed from zero to 600/3500 rpm for different materials and applications; Variable speed trigger allows user to control speed from 0 to dialed maximum setting; Heat-treated, precision-cut steel gears for smooth operation; Wool ingestion shields eliminate wool ingestion increasing tool life and reducing service costs; Non mar rubber gear case cover reduces surface imperfections and improves gripping surface