Excellent contrast scales: The striking black and red scales of this drawing triangle maximum brightness against any background and allow accurate measurements on light sheets or dark presentation surfaces for consistently accurate results. Classroom Demonstration Tool: Equipped with a base of 32.5 cm and a height of 23 cm,this additional set square serves as an excellent tool for the classroom. It improves architectural drawing activities and simplifies teaching processes through clear and easy operation during demonstration. Angle measuring instrument: the set hook with transparent protractor function allows precise angle measurements. This precision supports accurate drawing and helps students and designers achieve consistent results for different applications. Reliable learning tool: With reinforced ABS material,this drawing triangle meets the demanding needs of educational demonstrations and is against heavy wear,a reliable solution for practical teacher and student learning activities Improved control: The triangular ruler is designed with a non-slip handle and a red grip area,which allows stable operation and precise drawing accuracy. It allows seamless execution of geometric patterns or layouts on smooth surfaces for educational and creative applications., Manufacturer: WDWDW