To my knowledge, there aren't commercially available bits for retail purchase. I think you'd have to get a cutter(s) custom made. And if you are interested in trying to make your own snap together flooring planks, I think you'd have to use composite material of some sort. I don't think you can use solid wood for snap lock joints. The tongue of the joints is very thin, and real wood would likely break a lot along the tongue, as the grain runs parallel to the tongue. That is why all snap lock flooring is either composite material, or plywood type products. But if you do make your own out of composite or ply, you have to worry about how to finish the tops to make them look like legitimate flooring. Are you just trying to repair already manufactured snap lock flooring?