Wikipedia
Dowelmax
The Dowelmax is a loose tenon dowelling jig manufactured by the O.M.S. Tool company in Canada. The manufacturer claims that the small manufacturing tolerances of for the aluminium, brass and steel components of the jig ensure accuracy and repeatability. The precision manufacturing adds to the unit's cost, which is higher than other dowelling jigs.
The tool allows the placement of five dowels in one pass. A distance gauge bar provided with the jig allows accurate spacing between sets of dowels.