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Camco's FasTen blocks interlock so you can stack them to the exact height needed to level your RV, whether you're dealing with single or dual wheels, a tongue jack, stabilizer jacks, or tandem axles.
Each block measures 8-1/2 by 8-1/2 by 1 inch and uses a quad-grid design engineered to bear heavy loads without flexing. The integrated T-handle lets you lift the whole stack to carry it, then twist it down to lock the blocks together for storage. For best results, keep your stack height to 4-1/2 inches or less.
Keep stack height under 4-1/2 inches for the most stable setup.