Excellent contrast scales: The eye-catching black and red scales of this drawing triangle maximum clarity against any background and allow precise records on light sheets or dark presentation surfaces for consistently accurate results. Classroom Demonstration Tool: Equipped with 32.5cm base and 23cm height,this oversized set box works a great classroom tool. It improves architectural drawing activities and simplifies teaching processes through clear and easy handling during demonstration. Angle tool: The set square with transparent protractor function allows precise readings of angles. This precision supports precise drawing and helps students and designers achieve consistent results across different applications. Reliable teaching compound: With reinforced ABS material,this drawing triangle meets demanding teaching demonstration needs and resists hard wear,a reliable solution for teachers and students handy learning activities Enhanced Control: The triangle ruler is designed with a non-slip handle and red grip area,allowing stable handling and precise drawing accuracy. It allows seamless workmanship of geometric patterns or layouts on smooth for educational and applications., Manufacturer: WDWDW