Torque Arm Bolt Circle Diameter 2.95 in Output Face Inside Diameter 2 1/4 in Overall Length 5.718 in For Use With 720 Series PowerStar Compatible Gearmotor Grainger Part Number 46E551 46E552 46E553 46E554 46E555 46E556 46E557 46E558 46E559 46E560 46E561 46E562 46E563 46E564 46E565 46E566 46E567 46E568 46E569 46E570 46E571 46E572 46E573 46E574 46E575 46E576 Arm Mount Hole Diameter 0.265 in Includes Mounting Hardware Yes Number of Positions 9