Quite expensive but almost impossible to find a tongue over 1/2 inch. I needed a 5/8 cutout for the bee boxes. I bought this and a set of washers/rollers. Couldn't be happier. Cut like a dream.
Needed a wider (3/4 inch) slot for a thermal glass panel I installed in a door for a wine cellar. The cutter worked flawlessly, leaving a clean, even sheet pile. Great cutter, you need a heavy duty router to use it.
I have always had good results with this company and this bit is no exception. One of two bits I could find that could mill a 3/4" rabbit (yes you can work with less depth by changing the bearing). I am very happy with their work. I highly recommend them. .