Atlas Dual Assist Arms for 700 Series Tilt-Back Tire ChangersAtlas Dual Assist Arms for 700 Series Tilt Back Tire Changers SKU ATEATTC DAA T The Atlas Dual Assist Arms for 700 Series Tilt Back Tire Changers is the combination of the Atlas LHA and the Atlas RHA. When you buy these two arms at the same time, you save money. The Atlas Left Hand Assist Arm is a pneumatic assist arm for mounting and demounting many of the stiff sidewall tires found on today's vehicles. The Atlas Right Hand Assist Arm for 700 Series