Package includes 1 PCS 300MM Center Finder Tool, it 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. Clear Reading tools: 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. Convenience MarkingTool : 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. Functions: this round center finder compass can find the center point on irregular items with a diameter of 300 mm/ 11.8 inches; For example, you can easily find the largest circle on the log, avoid unnecessary waste of wood corners, and achieve maximum output. Wide range of applications: this lathe centering tool can draw a circle with a radius of 10mm to 150mm; It 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.