Features: There are 2 types, one is 20cm/ 8 in, another is 30cm/ 12 in. Simply tap a small nail or pin (not include) through the center hole, insert a pencil in your choice of diameter hole, and pivot around the center point to make your circle mark. With laser scale, the round center finder compass is clear to read and not easy to get dirty or damaged, Before use, please tear off the film on the reading, so that you could see the reading more clearly and more convenient for you to use. Made of high quality acrylic material with a central hole and clearly marked circles, which allows you to see exactly what you are doing and helps you measure quickly and easily. Can be applied wherever a circle is needed, fits for wood turning, art, crafts, school projects and finishing woodworking; For wood, poster boards, plastic, metal, glass, composite materials, etc. Package Includes: 1X Circle Center Finder Specifications: Material: Acrylic Diameter: 20cm/ 8 in , 30cm/ 12 in note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it