Bal Products 29005 Top Wind Swivel Mount 800 lb Capacity Tongue Jack for RV TrailersCorrosion Protection Jack tubes are coated with a rust inhibitive process called E coat. The coating can also serve as primer for custom paint finishes. Precision Metal Gears Jacks incorporate precision molded, heat treated, copper alloyed metal gears and nuts. High Performance Bearings. Protective Lubricant The internal screw is coated with a specially formulated lubricant. Top wind model has a high strength handle 800 lb capacity. Caster included No