Bottle jacks are devices that are used to lift heavy objects. They are often used in automotive and construction applications. Bottle jacks get their name from their shape, which resembles a bottle. The jack consists of a cylindrical body with a piston inside. The piston is connected to a rod, which extends out of the top of the jack. To use the jack, you simply place it under the object you want to lift and pump the handle up and down. This causes the piston to move up and down, which in turn raises or lowers the object. Bottle jacks are available in a variety of sizes, so you can choose one that is appropriate for the job at hand. They can be used to lift cars, trucks, and other heavy vehicles. They can also be used to lift heavy equipment such as Harley-Davidson motorcycles or ATVs. In addition, bottle jacks can be used to level trailers or RVs. If you are working on a project that requires lifting, a bottle jack is a useful tool to have on hand. It can make the job much easier and safer by allowing you to lift heavy objects with ease.