This ESCO Pro Series Wheel Chock is designed to keep any vehicle or trailer in place and prevent the tires from rolling. This professional grade wheel chock is extremely durable, heavy duty and built to last. Unlike wood, rubber, or steel wheel chocks ESCO Pro Series Wheel Chocks have a solid polyurethane center. This solid durable design is what makes them maintenance free and have a much longer usable lifespan in any climate. ESCO wheel chocks are weather, water and oil resistant so they will never crack, chip or dry rot because of weather or abrasive chemicals. The top of the wheel chock is a non-slip surface featuring a raised grip so your tires wont ever slip. While the bottom of the wheel chock has a “VInches shaped grip pattern for better grip and leveling on uneven surfaces. Each ESCO Pro Series Wheel Chock has a built in holes for easy storageallowing you to install ropes, chains and/or mounting brackets. The ESCO Pro Series Wheel Chock is sold individually and meets OHSA/MSHA standards.