CURT HD wheel chocks are a perfect accessory for saving space and staying safe. Made to mount to the CURT trailer frame bracket for storage outside of your truck or RV, these unique wheel chocks are made to do two things: keep you safe and save space in your vehicle! These HD wheel chocks are made from heavy-duty rubber and prevent trailer or vehicle movement. The dense rubber construction features deep grooves which provide improved traction and prevents chock slippage or movement. Durable enough to last and storable when not in use.