The Eaz-Lift 18-Inch Wheel Stop with Wrench and Lock prevents your RV tires from shifting by simply using this one piece of equipment. It fits tire spacing from 9 to 18-inches and features raised ribs to provide increased traction. The wheel stop expands to 18-inches wide and includes a lock and ratchet wrench. It is zinc-plated for corrosion resistance and is easy to install. Locks in place to deter theft.