The Camco FasTen Leveling Blocks allow you to stack the interlocking blocks to the desired height for safe and easy leveling. Each block adds a full inch to stack height. Camco& 8217;s FasTen 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 blocks together for storage. Cacmo 44514 FasTen Leveling Blocks with T-Handle, 2 x 2: The Camco FasTen Leveling Blocks allow you to stack the interlocking blocks to the desired height for safe and easy leveling Each block adds a full inch to stack height Camco's FasTen 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 blocks together for storage They have a strong, durable construction and are engineered with a patent-pending design to optimize both strength and weight, resin is UV stabilized and built to last even when exposed to sunlight for extended periods of time Bright, visible yellow color helps you see them so you don't leave them behind They can also be used to help prevent your stabilizers from sinking in soft ground Camco's FasTen Leveling Blocks 2x2 measure 8-1/2" x 8-1/2" each and can be used with stack jacks, trailer tongues, 5th wheel jacks and swing arm supports If dirt or debris build up in the leveling blocks, just knock it off and hose it out before storage Stack height should not exceed 4-1/2"