Features Small Error: Aluminum alloy right angle scribing squares adopts high accuracy laser scale, which is accurate and easy to read, with small error High Accuracy: There is marked hole design in the ruler, the hole position and the diameter of the hole are accurate to 1mm, convenient for marking and measuring the length and improving the accuracy Multi Function: Aluminum alloy right angle scribing ruler can draw circles, scribe lines, draw hinge holes, measure angles and other functions in all 4 Hole Design: The handle adopts 4 hole design, which is more ergonomic, easier to grasp the tool, and improves the overall appearance Aluminum Alloy: The whole body is made of aluminum alloy, the appearance is anodized, high hardness, and very durable Specification: Item Type: Aluminum Framing Woodworking Squares Material: Aluminum Alloy Metric Scale: Approx. 300mm / 11.81in Base Aperture: Approx. 20mm / 0.80in Base Length: Approx. 180mm / 7.10in Arc Diameter: Inner Diameter Approx. 40mm / 1.57in, Outer Diameter Approx. 60mm / 2.36in Package List:1 x Aluminum Framing Woodworking Squares1 x Wrench1 x User Manual Note:Match to the right size before use Package List 1 x Aluminum Framing Woodworking Squares 1 x Wrench 1 x User Manual