E-Track Roller Idler Fitting Assembly with 3,300 Lb. capacity. Roller idler can be very helpful when securing your car to your trailer. To tie down your vehicle, the ratcheting typically needs to be done underneath the car - where there often isn't enough space. And if you try to run the strap out from underneath the car so that you can use the ratchet, the strap rubs against the bumper. The Erickson E-track roller allows you to easily use a ratchet to tighten the strap while keeping the strap from rubbing the bumper. The sturdy idler helps you route tie-down straps for easy ratcheting while also protecting your cargo. Can be used with Erickson's Horizontal or Vertical E-Track system. Inside width: 2.1 In. Outside with: 3.3 In.