Finger joint
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A finger joint or box combing or box joint is a woodworking technique used to join two pieces of wood at right angles to each other. It is much like a dovetail joint except that the pins are square and not angled and usually equally spaced. The joint relies on glue for holding together as it does not have the mechanical strength of a dovetail.
The joint is relatively easy to make using a table saw or a wood router with a simple jig.