7"/9" variable speed polisher has a powerful, 12.0A all ball-bearing construction motor for long life. Electronic control maintains specified speed under load delivering desired finish results. Conveniently located variable speed dial lets user set maximum speed from 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.