An adjustable prop jack used in scaffolding is a height-adjustable support designed to provide vertical support and leveling for scaffold structures or formwork. It consists of a steel tube with a threaded screw mechanism and a base plate or footplate. By turning the screw, the height of the prop can be finely adjusted to suit uneven ground or to achieve the required scaffold or formwork height. Once adjusted, it transfers the load safely to the ground and ensures stability. Adjustable prop jacks are commonly used in shoring, temporary supports, and scaffolding systems where precise leveling and load-bearing capacity are needed. They are especially useful for uneven surfaces or variable-height structures.