- This set includes two 12Inch + 6 Inch rulers, offering for precise measurements. Safe Edge - 0.9mm thickness avoids edges, ensuring safe and comfortable operation. Smooth Design - The ends are smooth and burr-free; one end is square and the other end has a round hole for easy hanging and storage. Great Tool - Great for schools, offices, training classes, papermaking and craft work. Great for , engineers and architects, the rulers can be used as a drawing straight edge or measuring device. Colour:Red Material:Plastic Package Contents: 1set * straight edge ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.