characteristic: Adjustable angle, accurate calibration and convenient operation. Aluminum alloy material, wear and rust, . Find the hole corresponding to the scale, insert the pen into the hole, and draw the desired line. Precision marking t-rule helps you draws perfect horizontal lines while sliding the rule along the edge of your work. Notes: Please pay attention to safety when using it and wear protective gear if possible. describe Name: Woodworking Line Drawing Ruler Material: Aluminum alloy colour: Blue Due to different batches, the actual appearance may have slight color differences, which does not affect normal use. Package Contents: 1 x Woodworking line drawing ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.