This truly unique ruler is specific in length to the 1958 Impala and was intended to show the exact height of the car which was lower than other 58 Chevrolet's. Yard stick wooden rulers were common but this ruler is very special and was make to highlight the lower height of the new for 1958 Impala. In addition, it showed the length of various features specific to the 58 Chevrolet. It is in excellent condition showing very little wear. This is absolutely the only one I have ever seen, and it would be a valuable addition to the memorabilia collection of 58 Chevy lovers.