Metabo pe 15-30 7″ variable speed polisher features: power with ideal speed range for grinding and polishing stone surfaces maximum productivity with powerful 1,500 watt motor and high-torque planetary gear train vario-tacho-constamatic (vtc)-full wave electronics with thumbwheel: for working at customized speeds to suit the application material and speeds that remain almost constant, even under load front handle for safe and uniform guidance when working, adjustable without tools overload protection: protects the motor from overheating electronic soft start for smooth start-up restart protection: prevents unintentional start-up after power supply interruption auto-stop carbon brushes to protect the motor