- Size and range: Straight ruler 20 cm; triangle ruler with 7 cm and 10 cm edges; protractor 180 degrees; accuracy 0.1 cm; thickness 1 mm. - Material: Aluminum alloy for high hardness and toughness; rustproof and corrosion resistant; strong and durable; lightweight and reliable. - Features: Laser-etched, high-resolution scale markings that do not fade; easy to read lines and numbers with minimal eye strain; rounded corners minimize hand injuries. - Applications: Suitable for professionals and amateurs; an essential measuring and marking tool for architects, engineers, and carpenters; also ideal for precise measurements in classroom, office, or home. - Use scenarios: - Drafting and layout for architectural plans and design work. - Precision marking and measuring in woodworking and carpentry projects. - Geometry practice or exact measurements in school or DIY home projects.