Eliminates frozen inner/outer cap nuts. Eliminates the need for hand and foot aid in separating the nuts, therefore reducing needless injury. Reduces the work and potential for back strain because there is no need to lay the tire down. Won't lose its grip on the outer cap nut so there is no loss of torque, which will give the impact wrench maximum power and efficiency. Won't slip or rotate out of position, significantly reducing the potential for damage to chrome and aluminum wheels. Locks onto rim.