1. **Purpose Design**: Compact ruler doubles as a keychain accessory—easily carry a 5cm measuring tool with you at all times while keeping your keys organized. for school, office, or daily use, adding style and utility to your essentials. 2. **Durable Material Construction**: Made from sturdy zinc alloy for lasting durability. The mini ruler resists rust, bending, and daily wear, making it a reliable tool for students, artists, and professionals who need quick, precise measurements on the go. 3. ** for Everyday Carry**: Lightweight and convenient for daily use. This mini ruler keychain fits easily in pockets or bags, offering a practical measuring solution for math, crafts, or geometry needs whenever inspiration or necessity strikes. 4. **Gift and Souvenir**: A stylish and functional charm for all ages. Whether for students, teachers, engineers, or stationery lovers, this mini ruler makes a unique gift and collectible that combines practicality with sleek design.