4 pieces math geometry tool plastic clear ruler sets, protractor, triangle 4 Pieces math set: 4 In 1 geometry tool contains a straight ruler, a protractor, 2 x triangle ruler (45 and 60 degree). Clear and accurate: Geometry tool set have inches and metric scale with clear and easy to read markings. Transparent rulers and through it you can see the page. Geometry tools are constructed of plastic material, lightweight, easy and handy to be put into your school bags or in your desk. Wide application Math geometry tool set are useful tools for architects, engineers, artists, designers, students, teacher, etc.