Happijac Screw Jacks have a 1,500-2,800 pound capacity per jack. HappiJac Jacks include an outer tube that has been zinc plated and then powder coated for superior corrosion resistance. They also have a wiper at the bottom of the jack to help prevent debris from getting into the jack leg, and a zinc plated inner leg. All Happijac jacks have an electrical upgrade option and have a one year warranty.