The Milwaukee Tool M18 FUEL 4-1/2"-6" Braking Grinders, Nos. 3670-20, 3671-20, and 3672-20 generate 13A corded power and use a POWERSTATE brushless motor and REDLINK PLUS Intelligence for maximum sustained power and 9,000 rpm. The grinders can deliver up to 135 cuts per charge and stop in under two seconds with RAPIDSTOP braking technology. An electronic clutch provides kickback protection, and overload protection ensures a maximized motor life. They're available with a paddle switch (No. 3670-20), a slide switch (No. 3671-20), or a paddle switch with ONE-KEY (No. 3672-20).