Features: 1. Can be used to find the center of the circle within 650mm diameter 2. Place the tool on the end face of the material when using it. Draw two straight lines at any angle. The place where the lines intersect is the center point. 3. The middle ruler can be extended and shortened to adjust the length. When it is in the proper position, the handle is tightened and the operation is simple. 4. Made of high quality aluminium plate material, sturdy and durable 5. Quickly find the center of the circle, simple and convenient Specification: Condition: 100% Brand new Material: Aluminium Plate Size: Approx. 33 x 14.8cm / 13 x 5.8in Package List: 1 x Circular Finding Center Ruler 1、Can be used to find the center of the circle within 650mm diameter 2、Place the tool on the end face of the material when using it. Draw two straight lines at any angle. The place where the lines intersect is the center point. 3、The middle ruler can be extended and shortened to adjust the length. When it is in the proper position, the handle is tightened and the operation is simple. 4、Made of high quality aluminium plate material, sturdy and durable 5、Quickly find the center of the circle, simple and convenient