This glue joint bit, like other tongue and groove cutters, increases the surface area of the joint. With this increased area for glue, you'll have a stronger joint. Another nice feature is the single set up required to cut either piece.
This cutter is heavy duty, 1-1/2" in diameter with a 1/2" shank. Use it in a router table with a fence capable of being setup with an offset, like a jointer. As long as your fence has removable sub-fences, shim out the out-feed approximately 1/32nd of an inch.