A crescent wrench, also known as an adjustable spanner, is a versatile hand tool used for gripping and turning nuts and bolts. It features a movable jaw that allows the user to adjust the width of the opening, making it suitable for various sizes of fasteners. This tool is commonly made of steel and is popular among both professionals and DIY enthusiasts. The design of the crescent wrench includes a flat handle and a jaw with serrated edges for better grip. It is often used in plumbing, automotive work, and general maintenance tasks. Its adjustable feature distinguishes it from fixed-size wrenches, such as box wrenches or open-end wrenches.