Description: 【Ideal Use】Universal Angle Ruler is Used for model parts detail transform production, model parts surface engraving line use. 【Design】Protractor design can measure the angle, the middle is set with a line groove and accurate engraving angle graphics. 【Accuracy】The protractor ruler can be used to measure Angle and length. The line the ruler indicates that the reading Angle is more accurate. 【Stainless Steel】The angle measuring ruler is made of high quality stainless steel,3.15'' in size, wear resistant, can be used for a long time. 【Easy to Use】Prepare the material, use the cover tape to prevent loosening, to carving the required angle lines, the thinner material directly carved out of the thick material first carved out of the line, put a ruler along the line Further deepening. Size Chart: 8cm/3.15inch Package Includes: 1 Protractor Note: Please allow slightly errors due to manual measurement and different monitors.