Aluminum Alloy Anti Slip Laser Calibration Ruler Student Cutting Protection Drawing Tool School Office Supplies Straight Scale Ruler for Woodworking Architect Engineer Feature: 1. No scratches: The protective plate has a 12.5mm/0.49in high baffle to prevent hand scratches. 2. Material: Aluminum alloy ruler is oxidized, durable, lightweight design, suitable for office and home use. 3. Clear scale: The scale is laser-calibrated, not easy to fade, and is clear and easy to read. 4. Anti-seepage design: It can avoid the structure marking when the ink penetrates due to the ink drag phenomenon. 5. Anti-slip: The thick anti-slip strip ensures the stability of cutting and marking. 6. Easy to store: With hanging holes, you can hang it on the wall for easy storage. Specification: Material: Aluminum alloy Surface treatment: Oxidation Size(optional): 20cm/7.87in, 30cm/11.81in, 45cm/17.72in Scope of application: Suitable for architects, engineers, carpenters and other students and professionals in technical drawing projects. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3cm measuring deviation due to manual measurement. Included: 1 X Protective Ruler