18V 5.0Ah LXT lithium-ion brushless cordless 4-1/2 in. and 5 in. cut-off/angle grinder kit. Brushless motor eliminates carbon brushes increasing tool life. Electric brake stops the grinding/cut-off wheel. Automatic speed change technology adjusts speed and torque during operation. Active feedback-sensing technology turns the motor off if rotation of the wheel is suddenly forced to stop. Efficient BL brushless motor is electronically controlled to optimize battery energy use for up to 50 percent longer run time per charge. Electronically-controlled BL brushless motor efficiently uses energy to match torque and RPM to the changing demands of the application. Weighs only 5.6 lbs. with battery for reduced operator fatigue. Rubberized soft grip provides increased comfort on the job. Slide switch with lock-on for operator convenience. 3-stage LED gauge indicates battery charge level. Soft start suppresses start-up reaction for smooth start-ups and longer gear life..