Looking for box joint shaper bit.

[Joe Hillmann]

I am trying to find a sharper bit for cutting box joints on boards 3 inches tall and 1/2" wide. All I can find in that height are finger joint bits. Can someone point me in the right direction to find what I am after?

[J.R. Rutter]

Most people just stack a few 1/2" straight cutters and space/shim between them. A side benefit of doing it this way is that you can remove the spacers and stagger the tips to get a budget spiral type cutter.