Hi,
I wanted to say that these are solitary bees, are non-swarming gentle-natured pollinators, and good neighbors.
This is a pretty nice little project if you have a router table.
Casey

Yes, thank you for mentioning that Casey. I forget that many people have not heard about solitary bees. Including the mason bee.

They are a native bee that does not sting. And on a bee to bee basis that are a much more effective pollinator then the honey bee. They require simple houses with much less effort then the honey bee. And they lead a interesting life cycle.