X-LOCK quick change system allows for tool-free wheel changes with simple snap-on mounting and pull release lever for change-out The BL Brushless Motor eliminates carbon brushes, enabling the BL Motor to run cooler and more efficiently for longer life; delivers 8,500 RPM Active Feedback-sensing Technology (AFT) turns the motor off if rotation of the wheel is suddenly forced to stop Electric Brake stops the grinding or cut-off wheel in 2 seconds or less for maximum productivity Automatic Speed Change technology adjusts speed and torque during operation for optimum performance