Adjustable Set Square (45°)
Set Squares are a useful addition to your calligraphy Tool Box. They can be used to aid ruling-up including slope lines and as a guide to help keep your pen at the correct angle to the write-line. Both a 45° and 60° Set Squares are useful.However, the Adjustable Set Square (45°) is much more versatile. Although it is a 45° Set Square, one side of the triangle is adjustable, so it combines the functions of set squares and a protractor. It can be adjusted and set to any angle between 0° and 90°.