Curt HD wheel chocks are the ideal accessory for saving space and staying safe. These unique wheel chocks are made to mount to the Curt trailer frame bracket for storage outside your truck or RV. No more dirty wheel chocks inside your truck or SUV. Made from heavy-duty rubber, Curt HD wheel chocks prevent trailer or vehicle movement. The dense rubber features deep grooves which provide improved traction and prevents chock slippage or movement. Plus, the large handle makes it easy to grab and use.