A try square or try-square is a tool used for marking and checking 90° angles on pieces of wood. Though woodworkers use many different , the try square is considered one of the essential tools for woodworking. A try square is made of two key parts, the blade (also known as a beam or tongue) and the stock, which are fixed together at 90° to form an 'L' shape.The blade is usually made of steel and is fixed into the stock, which is usually thicker than the blade and made of metal Both the stock and the tongue are usually made with parallel edges. Typically the blade and the stock will be rectangular in profile.