Bal Products 29033Bl Top Wind A-Frame Screw 5,000 lb Capacity Tongue Jack for RV TrailersAll 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 tubing E coat protection. 5000 lb Capacity Inner Ram 2", Outer Ram 2 1