Flexible Circle Drawing Tool - The perimeter of the adjustable circle drawing tool circle maker can be enlarged or reduced, simply rotate the rings to open and close its captivating aperture mechanism, which can be applied to draw round and round measurements Circle Drawing Maker Size - About 12.5cm/4.9in in diameter. It's perimeter can be enlarged or reduced. Circle stencil can be used to draw round measurements and so on. It is a completely redesigned tool for drawing and measuring perfect circles. Simple to Operate - Just need to put the ring circle rotary circle template tool on where you need them, adjust the size of the center circle to suit your needs by rotating the golden edges, then draw along the circle with a pen, easy to apply and practical for your daily use High Quality Stainless Steel Material - The professional adjustable circle drawing ruler quick adjustment compass circle measuring tool is made of stainless steel, has good corrosion resistance and is not easy to rust.With this meter, you dont have to worry about the circle being drawn Ideal Circle Template Drawing Tool - Circle drawing compass is a math ruler that seamlessly creates a perfect circle in seconds. Adjustable circle drawing tool can be used as a 360 metrics for students and school students. Also ideal for engraving, carpentry, sewing, sewing and hoist design.