Features Centre Finder: Used to scribe the centre of the circular plate and the shaft, making the measuring much easier. High Accuracy: Ensuring high accuracy, this centre finding gauge will largely improve your working efficiency. Measure Range: With 100mm scale on the body as well as standard 45° and 90°, the ruler has wide measurement range. Good Material: Adopting premium aluminum alloy material, not easy to deform, has great durability for long use. Easy to Carry: Light in weight and compact in size, the center gauge tool is very convenient for daily carrying. Specification: Item Type: Center Gauge Material: Aluminum Alloy Measurement Range: Approx. 100mm / 3.94in Minimum Scale: 1mm Use: For woodworking measurement. 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: 1 x Center Gauge Package List 1 x Center Gauge