STABLE GAUGE MOUNT: Sturdy mounted knob can prevent the gauge from rolling, more stable, you can use with confidence DURABLE ALUMINUM ALLOY MATERIALS: Aluminum alloy body with hard oxidation treatment, possess comfortable grip, wear resistant, scratch resistant, durable WITH CLEAR SCALE: Come with clearly visible scale, easy to measure and read, quick and easy operation, balanced feel LINEAR ARC DRAWING HEIGHT MEASUREMENT: Three use multi functional wheel marking gauge can be used to draw circles, lines, and height measurement FOR VARIOUS MATERIALS: Wheel marking gauge is suitable for ceramic, iron, acrylic, wood, glass and other materials, very versatile Note: The data are manual measurement, please allow a 1-3cm error, due to the differences between the light and the display, there will be a certain color difference, the specific received in kind prevail.