Features Aluminum Alloy: The T type scriber ruler is made of aluminum alloy, which has good hardness and wear resistance. Smooth Exterior: The scriber is CNC finished, the surface is smooth and burr free, and it is not easy to rust and deform. Standard Size: With standard scale and screw holes, the accuracy is 1mm, and the drawing is more accurate. For Layout and Measurement: The T square ruler is often used in carpentry or artistic drawing to lay out and measure edges. Simple Carrying: Comes with a compact size and a light weight as well, the hole positioning ruler is very convenient to carry. Specification: Item Type: Hole Positioning Ruler Material: Aluminum Alloy Accuracy: Approx. 1mm / 0.04in Use: A tool for woodworking.  Package List:1 x Hole Positioning Ruler Package List 1 x Hole Positioning Ruler