Bosch Hammer Drill GSB18V 535CB15 RT 1 2 Inch Driver Kit Reconditioned (18V Brushless 535 In Lbs 28500 BPM CORE18V 4.0Ah KickBack Control Masonry) Welding Triple Chip Grind (TCG) Geometry: Triple Chip Grind (TCG) Geometry: Alternating flat and trapezoidal tooth shapes shear abrasive composite substrates cleanly to prevent blow out and edge chipping Slim Profile Head Geometry: Low clearance head design maneuvers effortlessly into tight corners Powered by an EC Brushless motor generating 535 in lbs of maximum torque and a hammer cadence of 28 KickBack Control Safety Sensor: Accelerometer automatically cuts electrical power to the motor in binding situations to protect users against severe rotational wrist injuries