【Double-Sided Scale】: This ruler features both inch and centimeter calibrations, with centimeters on one side and inches on the other. Whether you're drawing or measuring, it's flexible for most tasks. A fixed end allows you to easily draw straight horizontal lines. 【2-Piece Plastic Ruler Set】: Made from high-quality, BPA-free plastic, this set is non-toxic and odorless. Reusable and built to last. The ruler's measuring range is 30 cm, with a width of 3 cm and a thickness of 0.2 cm. Overall size is 31 x 3 x 0.2 cm. 【Easy to Calibrate】: Crafted from transparent plastic, this ruler allows you to see underlying notes, making it convenient for drawing and verifying measured lengths. A high-quality, T-shaped plastic head at the top ensures easy calibration. 【Practical Hanging Hole】: The tail end of this T-shaped ruler features a hole for easy hanging. Simply find a hook or nail after use. It won't take up space, and its clear position makes it easy to access. The lightweight material won't add extra weight to your hook. 【Practical Tools】: This transparent ruler with black markings is suitable for engineers, architects, students, draftsmen, artists, and more. It's a great assistant for your work and studies. With a durable ruler, you won't need to buy another one anytime soon.