RE: WHAT EASTON NUMBERS REFER TO THE WALL THICKNESS?
The 1st two numbers refer to the shaft diameter 23/64"
The 2nd two numbers refer to the wall thickness .014"
You need to reference the Easton arrow chart to pick the correct spine arrows for your setup.. If you wanted the same diameter but a thicker wall thickness.. your'd go w/ 2315, 2317, ect.. But as you increase the wall thickness.. you also stiffen the arrows.