ITEM NAME:Aluminum Alloy Circle Drawing Tool Woodworking Geometry Adjustable Size Features: Application: It is a completely redesigned tool for drawing and measuring perfect circles. Material: Made of aluminum alloy and stainless steel material, good corrosion resistance, not easy to rust. Adjustable: It's perimeter can be enlarged or reduced. It can be used to draw round measurements and so on.&;nbsp; Portable: This is an easy to carry plotter, and can be used in industry. Easy To Use: Simply rotate the rings to open and close its captivating aperture mechanism. Specifications: Type: circle drawing tool Material: aluminum alloy, stainless steel Color: gold+silver Inside diameter: about 7.9cm/3.11 inch Outer diameter: about 12.7cm/5 inch Package Include&;nbsp; 1pc x circle drawing tool &;nbsp; Note: Please allow 0-1 cm error due to manual measurement. please make sure you do not mind before you.Type: circle drawing tool. 1pc x circle drawing tool. Material: aluminum alloy, stainless steel. Anyway we will try our best to avoid this kind of thing. Portable: This is an easy to carry plotter, and can be used in industry.