You are looking at wooden window sash from the bottom up. The piece outlined in red is what I need to re-create. I cannot figure what bit I need to replicate the quarter round on the left side. It is the opposite of a 1/4" roundover bit which would lead me to believe that a cove bit or core box could be used. However, I don't believe that those match up with the shape or how I would be able to pass the piece over the bit. Your thoughts would be appreciated.