These are a must-have for builders and racers - you can see what the front and rear tire contact patch looks like, and you can also see where the rail is riding along the entire car and watch how the pickup shoes. Rail heights are honed.

This unit is yellow and has a 0.010" rail height.

If you are unsure of what rail height you need please see suggestions below:

          Tomy AFX / Plastic Toy Track  --  .014″ to .015″

          Custom Routed Tracks  --  .012″ to .014″

          T Jets  --  .010″ to .012″