Finger joints are used to make side-to-side or end-to-end joints in wood or wood composites. Box joint bits make just that; great looking, strong box corners. The tightness of the cut and the maximum glue surface create a joint that is stronger than the wood itself. The flush mounted bearing eliminates the need for complex alignment. Some have removable cutters to arrange for a variety of material thickness. Carbide tipped.
BOX/FINGER JOINT ROUTER BITS
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I wonder if that work for dinner chair frame ?
Yes, if you are talking about making longer pieces for the leg, back or seat. If you are planning to use this as the joint between the sections, no it won't work.