[ Easy To Use ] The diameter turn to larger by rotating clockwise, smaller by roteting counterclockwise. This is an easy to carry plotter, gauge, and can be used in industry. MAIN FEATURES: [ Premium Material ] Drawing tool is made of high quality Aluminum Alloy and Stainless Steel, its and not easy to rust, with good hardness, high strength, good resistance, easy to operate. [ Adjustable ] Diameter size can only be adjusted between 10mm and 77mm. Circle tool can be used to draw round measurements and so on. It can be adjusted, can be large or small. Simply rotate the rings to open and close its captivating aperture mechanism. [ Multipurpose ] Round circle template ruler tool is a great tool for students, carpentry. Can be used as a 360 metrics for students and school students. Also ideal for engraving, carpentry, sewing, sewing and hoist design., Weight: 0.42769678828 pounds, Manufacturer: ximie