Heavy Duty Construction, No More Rocking: Yesker wheel chocks are made of thickened heavy-gauge steel.High precision self-locking screw design and anti-slip threaded rod can effectively prevent the tire from moving and keep the vehicle steady. Built-in Wrench Design for Easy Using: 2 Packs rv stabilizer come with integrated rachet wrench.The whole installation process takes less than 1 minute. Tools-free installation, easy using and saving time! Anti-rust Coating, More Durable: The rv wheel chock is coated with corrosion-resistant zinc coating, which can effectively prevent rust and prolong service life.It's Very suitable for outdoor use. Movable Anti-slip Pads for Super Stability: The camper wheel chock comes with 4 movable anti-slip pads. It can fit the tires of different vehicles. And the bump design on the side of the anti-skid pad enhances the friction of the contact surface between the RV stabilizer and the tire, making the stabilizer firm and stable. Suitable for Most Trailers: The expand space range from 3" to 10". Fit for Travel Trailers, Campers, Class A Moto Home, Fifth Wheel Trailers, Heavy Duty Trucks, Toy Hauler, etc. NOTE: Please measure the tire distance of your trailer before placing an order.