Description : Professional scale ruler , great for architect , engineer , and mechanical draftsmen graduations and more . Good flexibility , can be used for flexural measurement . Includes 5 pieces rulers , clearly marked , easy - to - read . 12 Scales in One Foldable Ruler : 1 : 10 , 1 : 15 , 1 : 20 , 1 : 25 , 1 : 30 , 1 : 33 , 1 : 40 , 1 : 50 , 1 : 75 , 1 : 80 , 1 : 125 , 1 : 175 . Environmental protection material , mini and portable , convenient to use . Size ( Approx .): 19 . 5x2 . 8cm / 7 . 7x1 . 1inch . Package Includes : 1 Piece Architectural Scale Ruler Note : Please allow 1 - 3cm error due to manual measurement , pls make sure you do not mind before you bid Due to the difference between different monitors , the picture may not reflect the actual color of the item , pls understand , thank you