3Pcs Straight Ruler 30Cm/12" Hollow Wave Aluminum Rulers, Silver White

The straight ruler is made of aluminum alloy, with high hardness, strong toughness, anti-rust and anti-corrosion, strong and durable, lightweight and reliable. High-gloss anodized surface treatment that ensures lightweight construction while significantly improving its wear and corrosion resistance, plus laser-etched scale markings for sharp, durable readability. This ruler features a rounded-edge design with no burrs for safe handling that won't scratch your hands; its hollowed-out center comes with wavy lines to facilitate easy division and marking of measurements, while the integrated hanging hole allows for convenient storage and display by hanging. The straight ruler is widely used in geometric drawing, plane drawing, composition planning, and mathematical chart drawing; it is suitable for classrooms, architectural design, art design office occasions, and other work environments that require precise measurement or drawing. Try to avoid collision of the ruler with hard objects to prevent damage to the scale and affect the measurement accuracy. Please do not bend the folding ruler to maintain its accuracy and stability.