Lightweight yet durable design. All ball bearing construction. Safety release throttle. Ergonomic and durable composite housing. 0.4 hp and 20,000/25,000 RPM motor delivers the power you need for the toughest jobs. Enhanced grip design and low-profile throttle lever provides for extended run time without fatigue. MAX Comfort. MAX PERFORMANCE. MAX POWER. Spindle lock feature on the 5102MAX allows for faster abrasive changeovers and lube free design eliminates contamination of work environment.