Features Center Finder: Used to mark the center of the circular plate and shaft, making measurement much easier. High Accuracy: This center finding gauge ensures high accuracy and greatly improves your work efficiency. Measuring range: With a 100mm scale on the body and standard 45° and 90°, the ruler has a wide measuring range. Good Material: The use of high quality aluminum alloy material, which is not easy to deform and has long durability. Easy to Carry: The center measuring tool is lightweight and compact, making it very convenient for daily carrying. Specification: Item Type: Middle Teaching Material: aluminum alloy Measuring range: Approx. 100mm/3.94 inch Minimum scale: 1 mm Use: For woodworking measurements. Function: Draw the center line of a circle, find the center of a circle, draw a 45° line and draw a vertical line. Package list: 1x Center display Package List 1 x Center Gauge