These general purpose chocks have become the utility industry standard. They are composed of durable rubber to make them stronger and safer in industrial applications. Chocks are resistant to UV damage, weather and damage from moisture, salt, and oils. Their traction design gives them a great grip between the tire and road to reduce tire and pavement damage. Either side can be positioned against tire. RC450 Wheel Chocks are most often used in construction, utility, and other commercial industries.