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Corrosion Protection - Jack tubes are coated with a rust inhibitive process called E-coat. The coating exceeds the A.S.T.M. standard 2000 hour salt spray test. The coating can also serve as primer for custom paint finishes. Precision Metal Gears - All BAL jacks incorporate precision molded, heat treated, copper alloyed metal gears and nutsHigh Performance BearingsProtective Lubricant - The internal screw is coated from top to bottom with a specially formulated lubricant that provides increased protection against wear and corrosionHigh Strengh TubingAccessible gear housing making it easier to lubricate and repairDIMENSIONS: A) 8" to 22" extendedB) 13-1/2"C) 6"D) 6-1/2"Tube Diameters - Inner: 2" Outer: 2-1/4"