212mm (height) x 212mm (width) x 3mm (thickness) Used in the First-Class Architect Examination Due to the characteristic of only using one side, it has a knob in the middle, and the handle is popular for its ease of use. Many people have purchased it for the First-Class Architect Examination and have said that it has made drawing easier. There are also voices saying that it reduces the need to switch tools and increases drawing speed. Regarding the size, it is also evaluated as being easy to handle and maneuver. In particular, a 60-degree ruler is no longer needed, and since it also has a scale, a three-scale ruler is also unnecessary.