A wedge pin or wedge cleat is a metal fastening device used in shuttering to secure formwork panels and support elements. It is typically made of steel and has a tapered shape, which allows it to be driven into a slot or hole to lock components firmly in place. In formwork, wedge pins are often used with shuttering plates, props, or tie rods to hold panels tightly and prevent movement under the pressure of fresh concrete. When inserted, the wedge expands or locks the assembly, creating a rigid and stable connection. This ensures that formwork panels remain aligned, do not bulge, and transfer loads safely to supports. Wedge pins are easy to insert and remove, making the formwork system adjustable and reusable for multiple pours.