Q81C Wheel Center Finder Tool 30/20cm Round Compass Lathe Centering Tool for WoodOOTDTYThe features: there are 2 kinds, one is 20cm/8 inch, the other is 30cm/12 inch. Simply tap a small nail or pin (do not attach) through the center hole, insert a pencil into the diameter hole of your choice, and rotate around the center point to mark the circle. With the laser scale, the compass with a circular center is readable and not easy to get dirty or damaged, please tear the film off the reading before use, so that you can see the reading more clearly and more comfortable to use. Made of high-quality acrylic material with a central hole and clearly marked circles that allows you to see exactly what you are doing and helps you measure quickly and easily. It can be used wherever a wheel is needed, fits for wood turning, arts, crafts, school projects and wood finishing; For wood, posters, plastics, metal, glass, composite materials, etc. Specification: Material: AcrylicDiameter: 20cm/ 8 inch, 30cm/ 12 inchPackage Included: 1X Circle Center FinderNote: please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.