4 Pieces math set: 4 in 1 geometry tool contains a 6 inch/ 15 cm straight ruler, a 4 inch protractor, 2 x triangle ruler (45 and 60 degree)^ 2 Sides measurement ruler: transparent ruler and through it you can read conveniently; straight and triangle rulers with inch and metric scales on them.^ Portable and durable: geometry tools are constructed of plastic material, lightweight, easy and handy to be put into your school bags or in your desk.^ Easy to measure angle: 180 degree protractor, 45 and 60 degree set rulers make it convenient to get the angles' degrees.^ Wide application: math geometry tool set are useful tools for architects, engineers, artists, designers, students, teacher and so on; Good for students in school use