A buckle is a type of fastening used on watches and other accessories to secure them in place. It is typically made from metal and consists of two parts: a frame and a prong. The prong is inserted through a hole in the strap or band and then into the frame, which is then secured by pushing the prong into the frame. This creates a secure closure that can be easily adjusted for a comfortable fit and easily opened when the wearer needs to remove the watch. Buckles are commonly used for watches, belts, and other accessories and can come in a variety of styles to match the aesthetic of the item.