Metabo W24-180 8,500 RPM 15.0 AMP 7-Inch Angle Grinder Grinder is suitable for operation with 120-Volt direct current (protective low current) Utilizes a Marathon motor which provides up to 5 times the service life found in other grinders Has the standard Metabo winding protection grid which adds to the tool life Designed to run at high efficiency and have increased torque by utilizing optimum heat dissipation Has a twist-proof protective cover, that can be adjusted in seconds without the need of tools