Makita 9557NB 4‘1/2" Angle Grinder, with AC/DC SwitchMakita 9557NB The Makita 4 1 2 in. Angle Grinder has a labyrinth construction that seals and protects the motor and bearings from dust and debris for a long life, with an additional, protective zigzag varnish that seals the motor from contaminants by forming a barrier under rotation. This UL listed grinder provides high output power with its 7. 5 AMP motor that maintains a 11,000 RPM speed to produce excellent grinding with a 2 1 2 in. small