The jack is named for its cylindrical body, which resembles a bottle. It is typically made of high-grade, drop-forged alloy steel for durability. Key features include:Piston/Ram: The vertical rod that extends upward to lift the load.Saddle: A serrated or cleated pad on top of the ram that provides a secure grip on the load.Pump & Handle: A manual pump mechanism operated by a sectional handle to pressurize the hydraulic fluid.Base: A wide, rugged steel base that provides stability during heavy lifts.Release Valve: A screw-style valve used to safely lower the load by allowing fluid to flow back into the reservoir.