Drill Guide for 6mm dowels with three pilot holes (one in the center of the wood piece and two adjustable ones on each side).

This STL is for a 20mm wood piece with 20 and 30mm offset. You can adjust all parameter, including wood thickness in the On Shape model below.

https://cad.onshape.com/documents/ab97559ca6181c079eacaa5e/w/1828357d823143edf7f8ad81/e/aabd0a6d5143ea260afd27a8?renderMode=0&uiState=680097b826b89010b5ceff38

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