The Colorarte 45º/40cm Whiteboard Set Square with Magnet RCQ03 is a large-format geometric tool designed for use on whiteboards or slates in the classroom. The built-in magnet allows the set square to be fixed directly to the board, freeing the teacher's hands during explanations and ensuring greater stability when drawing 45-degree angles. At 40cm long, it is easily visible to the whole class, making geometry and technical drawing demonstrations clearer. It is an indispensable tool for teachers who want to make math lessons more visual and interactive.