Package Includes: A ruler composed of a 6 inch/15 cm straight ruler, a 180-degree protractor, a 45-degree triangle ruler, and a 60/30-degree triangle ruler, offering versatile functions to meet your various needs. High-Quality Material: Made of premium alumium alloy, lightweight, portable and durable, not easy to fade and break, can be used for a long time. Double Sided Scale: The metal ruler is metric on one side and imperial on the other, which can meet your different reading needs and will become a practical tool for you. Unique Design: The innovation design combines the straight ruler, triangle ruler and protractoe in a straight ruler, just a ruler to meet your different needs. And easy to carry, it offers a superior measuring experience. Widely Applications: 3 in 1 multi-functional metal rulers are useful tools for students, teachers, engineers, artists, designers, architects and more. It's can be used in office, school, studios and homes. Easy to measure and create.