Description:

An expander screw is a type of screw that is designed to widen or expand a hole. It typically has a threaded shaft and a conical or cylindrical tip that is wider than the shaft. When the screw is turned, the tip presses against the walls of the hole, causing it to widen. Expander screws are commonly used in woodworking and other applications where a tight fit is required, and can also be used to anchor objects in materials such as concrete or masonry. They are available in a variety of sizes and materials to suit different applications.