A machinist square or engineer's square is the metalworkers' equivalent of a try square. It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90.A engineer's square (machinist square) is the metalworkers' equivalent of a try square. Machinist try squares are made entirely from metal to guarantee accuracy. A notch is cut in the stock in line with the inside edge of the blade for accurate measurement even when there is a burr on the edge of the work.FEATURESLaying out lines perpendicular to an edge or side of a boardChecking edges and ends of boards to see if they are square with adjoining surfacesChecking the width or thickness of narrow boardsMeasuring short distancesChecking flatnessEngineering SquareSPECIFICATIONThe try square has a blade (straight edge) and a stock (beam), which are fixed together at exactly 90. The stock is much thicker than the blade. The edge of the blade and the stock are perfectly sharp and straight.