Instead of having just the thickness*2 values or thickness as an option for the pull down, how about adding an area or a table where we can input our tables values based on a gauge of metal. This way, when you click on the inside radius pull down you will see your gauges and the inside radius will automatically be input based on the values in your table. For instance: 18 gauge would equal a .030inch radius. All you would see in the pulldown is the title you input (18G) for example.
