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Jacks Stabilizers by Camco. Details:Camco FasTen 4 x 2 RV Blocks for Leveling allow you to stack the interlocking blocks to the desired height for safe and easy leveling with each block adding a full inch to the stack height. These leveling blocks can be used with single wheels double wheels hydraulic jacks tongue jacks stabilizer jacks 5th wheel jacks and tandem axles. The convenient carrying handle easily pulls up for carrying or twists down to secure the blocks together for storage. They are made of UV-stabilized resin for years of rugged use and their bright yellow color is highly visible for easy leveling. The stack height should not exceed 4.5 inches. Camco has been creating your favorite outdoor products since 1966 earning a reputation for providing superior goods with high customer approval.