Features: Find Center of Any Irregular Items --- This Clear Center Finder Compass can draw a circle and find the center point on irregularly shaped or rough items with a diameter of 200mm/ 7.9inch. Versatile Center Finder --- This centering tool with a different size diameter holes in a radius of 10mm(0.4in) to 150mm(6.0in). 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. Clear Round Design --- Clear arylic with clear index assists you with quick, easy placement, you can easily find the largest circle on the log, avoid unnecessary waste of wood corners, and achieve maximum output. Premium Quality --- Adopt premium transparent acrylic material, the item is environmentally friendly and durable with good light transmission and high definition. Easy to Use --- 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. Specification: Material: Acrylic Drawable circles: radius 10 mm to 100mm Diameter: about 20cm/7.87in Thickness: about 5mm/0.2in Color: transparent Packing List: 1 * Round Center Finder Compass