Wide range of applications: Place one brake pad in front of the wheel and the other on uneven ground to prevent the wheel from rolling. Safety devices for ramps or other lifting devices. The lower and upper spikes increase grip on tires, cars, trailers, caravans, motorhomes, motorhomes, cars and caravans. Anti-slip: The wheels are designed to prevent the vehicle from moving by holding it in place. Anti-slip effectively prevents the vehicle from rolling backwards and sliding sideways. Can be easily blocked in time on icy or rainy ground. For each loading ramp, wheel chocks must be provided. This can save lives if the truck tries to move during loading and unloading. Convenient storage: The car blocks are small and can be easily stored in your car without taking up much space. Easy to carry, light and easy to lift off the ground to prevent tires from slipping. Stable characteristics and high reliability. QUALITY PRODUCT: The wheels made of high-quality PP material have good corrosion