The Bosch GWS18V-45 18V 4-1/2 In. Angle Grinder is an ideal portable cordless grinder for trade professionals who need reliable, robust power. With its four-brush motor design and optimized gear structure, it provides 10,000 no-load RPM, to handle cutting and grinding applications. It features a two-position Vibration Control side handle for better handling and less operator fatigue. It is designed for long tool life, with Bosch's Electronic Cell Protection and Electronic Motor Protection as well as optimized brush design. For user protection, this cordless grinder was engineered with a quick-change, burst-resistant wheel guard and restart protection to avoid accidental startup.