Hand thrown over the top rack and also known as Jack, machine Jack, hand-lifting gear. Can be served in a variety of engineering and lifting her top lifting effect. To improve efficiency, reduce labor intensity has played a good role. Commonly used as a lifting tool, lifting low hand thrown over the top, mainly using levers lifting, so can be used in a variety of settings. Hand thrown over the top not only can be used vertically, but also can be used in various ways, can achieve common products cannot achieve results, hand carry top handle with foldable design, operation simple and space-saving and easy to carry.