This is an extra heavy Diver Plate by Reliance Metals
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6"w x 12"L x .80" thick
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accepts 1/2" diameter or less mounting bolts
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weight: 11.43 lbs. (regular diver plate is only 7.75 lbs.)
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made to U.S. Mil-A18001 specifications
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we sell these to divers, boat yards and boat builders too