Abstract: An extension table for work tables such as a circular saw table, in combination therewith. The extension table provides a flat surface with a support frame for attachment to commercially available tables. The support frame is preferably connected to the work table work surface by means of "U"-channel member connected to the side of work surface. The "U"-channel has inwardly directed lips. There is an insert inside the channel connected to a flange of the remaining support frame, the flange and insert bearing against either side of the lips. The height of the flange is adjustable during installation so as to afford a flush alignment of the extension and work table surfaces.