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All screw jacks are equipped with nylon, ball or roller bearings on a hardened steel track. This provides the consumer easier cranking, reduces wear and increases the longevity of the jack. The internal screw is coated from top to bottom with a specially formulated lubricant that provides increased protection against wear and corrosion. Manufactured from high-strength, low alloy tubingE-coat protection5000 lb CapacityInner Ram 2", Outer Ram 2-1/4"Dimensions:A) 8" to 22" extendedB) 12"C) 7-1/2"D) 4-3/4" Tube Diameters- Inner: 2" Outer: 2-1/4"