The circle drawing tool is a math ruler that seamlessly creates a perfect circle in seconds. With this meter,You don't have to worry about drawing a circle. The drawing tool will not easily move during use to destroy the pattern you draw. It can be adjusted at any time during use; Flexible and convenient, and the circle drawing tool can be reused for many years. Main Features[Premium Material]The drawing tool is made of high-quality aluminum alloy and stainless steel, It is durable and not easy to rust, with good hardness, high strength, good corrosion resistance, easy to operate. [Adjustable]The wheel tool can be used to draw circular measurements and so on. It can be adjusted, it can be large or small. Simply turn the rings to open and close its captivating aperture mechanism. The maximum diameter of the circle can be drawn is about 12.5cm / 4.9in. [Easy to Use]The diameter changes to larger by rotating clockwise, smaller by turning counterclockwise. It is an easy-to-carry plotter, precision gauge and can be used in industry. [Multifunctional]Round circle ruler template is a great tool for carpentry students. It can be used as 360 indicators for students. Also ideal for engraving, carpentry, sewing, sewing and hoist design. SpecificationsMaterial: Aluminum alloy and stainless steelWeight: 205GSull diameter: 12.5CMPead includes: 1 x Round ruler with compass