I picked up a Craftsman router table that had the inserts missing so I created my own. Files include inserts with ½" to 1 ¾" holes. 

NOTE: It has been reported that only the 1 ¾" file is downloaded. This happens if you select “Open in Bambu Studio” option. If you want all the sizes, click on the “down arrow" and choose the “Download STL/CAD Files”. This will give you all the sizes in the package. Please, let me know if this worked for you.