Grade 70 Ultimate Axle Chain Assembly attaches to the vehicle axle when tying down secondary attachment chains. Simply slide the 8" J-Hook or Grab Hook with chain, between the frame rail and tires and hook to the axle. Then attach the grab hook to the truck frame and use the second grab hook to shorten the chain. Boom up your wheel lift and the tandem axle is now off the ground. Ideal to use two chains (one on each side). Sold individually.Not for recovery.