Product Description: Advantages: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.The angle protractor is made of quality stainless steel, with good durability and wear resistance, not easy to rust, and can be applied for a long time.4.You can lock the adjustable protractor arm into desired position with knurled thumb nut to quickly and easily identify angles, and adjust the screw if it feels too tight or loose before using the ruler. 5.The angle protractor is suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement etc. Specifications:Material: Stainless steelColor: Silver Size:Length: Large: 24.8cm/9.76inch, Small: 19.8cm/7.8inchWidth: 5.1cm/2inchAngle range: 0-180 DegreeScale Measuring Range: 0-150mm/0-5.9inch, 0-200mm/0-7.87inchWeight: 181g Package include:2 x Angle Protractor Tools