SCH80H, Set of 2 Squares with in-built Protractor & French Curve 2 Pieces of large clear triangle rulers: 13cm 45/ 90 degrees and 27 cm 30/ 60 degrees; Material: plastic; Durable, sturdy and easy to use Unique design: 2 kind of measuring units,  With hollow centre: the student triangles are easy to grip; The hollow centre 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. Ideal additional tool for pattern grading, marking or quilting
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