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Qty 4 - Large Suction Cups for Handling Mirror-Finished Materials - $25 (Kure Beach)
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Each suction cup is 4.5-inch diameter, yielding about 16 square inches each (32 square inches per unit).
With clean surfaces, each unit can provide 125 lbs lifting force, or 250 lbs if used in tandem (one suction cup unit each side of material).
Price is $25 firm for all 4.