The Bosch Core18V 4-1/2" Angle Grinder Kit (GWS18V-45B14) is designed with the end user in mind. With its four-brush motor design and optimized gear structure, the GWS18V-45 grinder produces 10,000 no-load RPM. It features a two-position vibration control side handle for better handling and is built for long life, with overload protection and lifetime brush design. The Core18V 6.3 Ah battery provides more power than the previous-generation batteries, delivering performance comparable to competitor batteries that are up to 35% larger.