Only one hand is needed to use Blue-Point 1/2 in. square drive Model AT600. Ergonomic handles' surface provides maximum grip and reduced vibration. One-finger forward/reverse lever frees other hand. Wrench reaches 550 lb-ft forward torque; 600 lb-ft reverse. Twin hammer mechanism operates at 7,000 rpm forward; 8,000 rpm backward. Front and rear housings are chemically bonded to molded grip for motor protection. Tool weighs 4.1 lb.