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Measurement: The maximum diameter of drawing circle is approx. 10 inch, enough for you to use as studying tools or for professional surveying and mapping. Designation: The holding part with screw design which is easier for using without slipping, with fixing screw to adjust the size for drawing different kinds of circles, flexible and adjustable. Wide range of applications: It is suitable for school classes including math, geometry, also can be applied for drawing and working. Specifications: Material: metal Color: navy blue Max circle diameter: 10 inch Package includes: 3 x Professional compasses 6 Boxes of lead refills (18 pieces in total) 3 x Screws (replacement part) 3 x Nuts (replacement part) Warning: pointed items, small parts, be careful when using and keep it away from children under 3 years old.