Idler arms are used on vehicles with steering box style systems. Idler arms are normally attached directly to the center link, and they support the front steering components because they attach to the body of the vehicle. On some light-duty trucks, two idler arms are used.

• Metal design of internal components — Internal metal designs are widely used in the manufacture of Mevotech X Factor idler arms. These designs incorporate highly durable upper and lower metal bearings that surround the ball joint stud and ball, and they include grease fittings to allow for grease and lubrication to be injected into the central area to prolong the life of the ball joint.
• Black oxide coating — The black oxide coating provides high resistance to variable corrosion factors such as road debris and adverse road and weather conditions, ensuring prolonged life of the idler arm.