Abstract: A jig for cutting dovetail joints includes a rigid template (1) attached to a block (4). A T-slot (6) along the top of the block locates a stop (8) which is used to align the edges of boards into which dovetail joints are to be cut. The rigid templates (1) includes a row of tapered fingers (2) and an opposing row of straight fingers (3). Shims (16) are used to adjust the position of a backing board (14) relative to the tapered fingers (2), thus providing adjustment in the fit of the dovetail joints. The device is adapted to be used in conjunction with a table-mounted router having a template follower or bearing fitted to the shank of the cutters.