Comes With Box - A free sturdy blue plastic box is provided for you to help you carry and store easily while avoiding any damage! Premium Material - The square measuring tool is made of heavy-quality carbon steel to ensure complete rigidity, the rivet connection design ensures it is safe and secure, the surface is smooth and delicate, tactile is comfortable. Precise Measurement - The heavy-duty widened base ensures that it is more stable upright, does not tilt, and is not easy to fall over. The measured data will not have errors due to movement, which is more accurate than other mechanical tools on the market! Wide Applications - Suitable for various engineering measurements, including measuring vertical deviation of internal and external angles. The accurate 91-degree right angle ensures accurate measurements, and the right size ensures you can hold the ruler more easily and firmly. NO RISK PURCHASE - Just try our products and we believe that you will love them as we do, If you dont like it or you are not satisfied with it, you can email us and we will provide you with a solution, we are at your service and will try our best to do it well for you.