This upgraded labor-saving jack features an all-steel solid base with a thickened solid steel bottom plate, ensuring stable center of gravity and significantly enhancing the product's bearing capacity and durability. A pair of handle adjustment springs can support up to 400 lbs., and the 10 in. lifting capacity meets most common needs. The tool is equipped with a thickened high-strength spring, contributing to a longer service life. The newly upgraded lift arm is designed for home use, suitable for household scenarios while retaining the traditional wall tile leveling function. Made of 45 # solid steel, this ultra-high-quality energy-saving arm serves as a height adjustment and labor-saving tool, with a lifting rod that includes a scale for accurate positioning and a fast lifting speed. The manual lifting tool has an ergonomic iron handle, which is hard and durable, helping installers complete work easily, reduce fatigue, and improve efficiency. The labor-saving arm design, combined with a comfortable handle and handheld structure, makes it lightweight and convenient to carry anywhere. This multifunctional force-saving arm is suitable for various scenarios: it helps lift furniture easily for cleaning, and is ideal for installing doors, windows, cabinets, floors, porches, decks, and frames. Using the jack is simple: press the handle to rise quickly, and hold down the handle while pressing the lower pressure plate to achieve slow descent.