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Interlocks with #56865 and #56857 Leveling Blocks to stop dangerous wheel movement and rolling. Sized for larger truck, trailer and RV wheels, the 8 1/4" W chock and half block let you level and chock simultaneously. High impact polypropylene with a corrugated surface. Lighter than wood, won’t rot or absorb moisture. Easy to clean—just hose it off. Made in USA.