Round Head Angle Protractor,Stainless Steel Protractor Finder Angle, Round Head Arm Measure Ruler Tool, for Engineer, Angle Measure, Student Drawing Model: Dual Arm 90X250 High-quality materials: The angle measuring ruler is made of high-quality stainless steel, which has high durability and wear resistance. The surface of the product is smooth, rust-proof, and can be used for a long time. 2 in 1 Angle Measuring Ruler: The combination of a ruler and a protractor can measure the length with a fixed ruler and measure another length with a movable ruler, which can be easily measured. Easy to use: The angle measuring ruler can rotate the protractor 180 degrees through the adjustment nut, and the ruler can be locked in the desired position at a fixed angle, so that the angle can be measured quickly and easily. Use precision: The measuring ruler angle adopts metric scale, and the scale on the base and the ruler is precisely laser engraved, then filled with black to prolong the service life and make it easy to read. Detachable and versatile : Detachable ruler arm and dial head. Very suitable for students, mechanics, DIY work, carpenters and woodworking enthusiasts, vehicle maintenance and repair, construction, drawing radial line patterns, defining bevel angles and offset angles. Description: 1. The angle measuring ruler is made of high quality stainless steel, which has good durability and wear resistance. It is not easy to rust and can be used for a long time. However, please be careful of the sharp peaks on the edge of the stainless steel. Please use it with caution. 2. The angle can be recognized quickly and easily by locking the knurled nut at the desired position, and the angle can be fixed for drawing, which is suitable for adjusting the bevel angle, drawing the radial line, measuring and marking the angle. 3. The angle measuring ruler is suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement, and is an ideal gift for students, craftsmen, architects and designers. Specifications: Material: Stainless Steel Color: Sliver Grade: 0- 180 Accuracy: 1mm / 0.03in Note: 1.It needs to loosen the adjustable screw vise body. 2.Avoid scratching the surface of the tool. 3.Please keep cleaning when you use and store.After you put it in the bag to storage. 4.This item size information is just for reference only, and allow 1-2cm differences due to manual measurement.