Square washers are a type of washer with a square outer shape and a round hole in the middle. They are commonly used in construction and engineering projects to provide a larger surface area for distributing the load of a bolt or screw. This helps prevent damage to the material being fastened and provides a more stable and secure connection. Square washers are often used in applications where a standard round washer may not provide enough support or where a flush finish is desired. Their unique shape makes them a valuable tool in the construction and manufacturing industries, where precision and durability are essential.