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With hollow center: the student triangles are easy to grip; The hollow center of 45/ 90 degrees triangle is a protractor and the other is a interesting hollow drawing pattern Wide application: the rulers with right-angle are useful tools for architects, engineers, artists, designers, students, teacher, etc.
BronaGrand Triangle Ruler Square Set 30/ 60 and 45/ 90 Degrees Set of 2 - B0767HXP8K