These rubber blocks, teamed with an extra wire hook or swivel hook, can turn any ratchet strap into a car carrier strap for hauling autos. Simply disconnect the loose end of your ratchet strap from the ratchet and slide 3 rubber blocks onto the strap. Then slide your extra hook on last and feed the strap back into the ratchet. Now you can run the strap over the tire and fit the rubber block's knobs into the rain groove of your tire. The new car carrier strap you created should fasten in front of the tire, behind the tire, and then a couple feet behind the tire for a 3 point contact.