The Bosch CAG180B 18V 4-1/2 In Angle Grinder is the most powerful cordless angle grinder in its class. It has a four-brush motor design and optimized gear design to deliver 0-10,000 no-load rpm. And at only 5.3 Lbs., it has the best performance-to-weight ratio in its class. This grinder can handle cutting and grinding applications in metal, masonry and tile. This tool has been designed for long tool life, with a lifetime brush design for long motor life. The Slim-Mount Burst-Resistant Wheel Guard prevents fragments from hitting the user, and it has Restart Protection to prevent accidental startup. The battery and charger are sold separately.