The iron sheet is cut 75 degrees with a 60-degree die.
First, put this touch tool on the floor, draw a square upward, set it as square AONB, and connect AB to make the diagonal of the square, thus getting a 45-degree angle. This line is between angles MON. Subtract 45 degrees from 60 degrees to get an angle of 15 degrees. The angle MOB is 15 degrees.