Measure twice, cut once, create always The circle master - Brass master round design companion 100% handmade in Turkey This is the perfect antique-inspired accessory for your desk or to carry with your journal. Made of 100% solid brass and etched for durability with both imperial scales. The circle master includes a protractor, imperial and metric measurements. It makes the perfect reference point for all applications. Product details: Diameter: 5.9' Ruler: 9 cm Black etched scale Thick brass Protractor* Metric measurements French curve** Circle cutouts * The protractor is an instrument used for measuring angles. The protractor is usually a semi-circle size divided into 180 parts or a full circle divided into 360 parts. ** A French curve is a template composed of many different curves. It is used in manual drafting and in fashion design to draw smooth curves of varying radii.