1.Accurate Measurement: 360 protractor pack of 15 angle finders are precise measuring tools that help users measure angles and arcs. This tool can improve the accuracy and precision of measurements to meet the needs of users 2.: The 360 swing arm plastic protractor is very easy to use and it helps users to measure angles and radians quickly and accurately. These swing arm protractors are designed to be very simple to use. Also, this tool is very lightweight and can be used anywhere 3.Sturdy Material: The protractor angle with swing arm is made of premium plastic that ensures its durability and longevity. This tool can withstand a certain amount of weight and pressure, and is not easy to be damaged and worn out, thus maintaining longlasting results 4. Design:The clear protractor with arm is designed to be portable. It can be used anywhere and anytime. This tool can be put in your pocket or toolbox, which is convenient for users to use and carry at any time