Rolling Parallel Ruler Foot Inch Metric Angle Rule Balancing Scale Multi-PurposeDescription:Features:brand new and 12 high-impact rolling ruler.Graduated in both inch and metric.Includes many useful formulas and conversion factors.Also has a built-in protractor, and holes along the top to help draw parallel lines and ellipses.Specification: Color: ClearSize: sizeLength: 30cm(11.81in)Quantity: 1 PCNote:1.Transition: 1cm=10mm=0.39inch2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Includes:1 X Roll Parallel Ruler