Features: - No scratch: A protective ruler with a 12.5mm high baffle protects the hand from scratches. - Material: Aluminum alloy ruler is oxidation treatment,  durable,  long lasting, lightweight design, suitable for office and home use. - Clear scale: The ruler is laser calibration, not easy to fade, clear and easy reading. - Anti seepage design: Structure marking can be avoided when the ink penetration caused by the phenomenon of ink drag. - Non slip: Thick non slip strip ensures the stability of cutting and marking. - Application: Good for students and proffesionals, such as, architects, engineers, carpenters and other technical drawing projects. - Easy to store: With a hanging hole, you can hang it on wall for easy storage. Specifications: - Name: Ruler. - Material: Aluminum Alloy. - Size: 20/30/45cm. - Color: Black. Package Includes: - 1 * Aluminum Alloy Ruler Note: - Please allow slight dimension difference due to manual measurement. - Due to different producing batches, product details might be a little different. - Due to different monitors and different light, the picture may not reflect the actual color of the item. - Please consider the actual sizes given in the listing as the pictures are generally enlarged to show detail.