Large Protractor for Teachers, 50cm ABS Extra Large Protractor, Hollow Center Design, for Engineer Dry Board Multifunctional

Protractor: 50cm/19.69inch, You can choose rulers as your needs. ABS material, wear resistance, not easy to deform, and will not scratch your hands. Clear large numbers design measurement; easy to read, suitable for blackboard, whiteboard, dry erase board, etc. Hollow center design, with detachable handle the teaching ruler is easy to grip. Are essential tools for architects, engineers, artists, designers, teachers and so on. Appropriate big size to use for geometry drawing and math class, fits for classroom, school or office.