The special shape in combination with swelling glue pockets and longitudinal grooves gives the dowels a secure hold. For absolutely twist-proof connections and maximum stability. And this with clearly faster processing: the first dowel hole is very easily aligned and milled to fit exactly with the help of stop flaps. It immediately fixes the workpieces to be connected exactly and flush to the edge. The DOMINO system also tolerates minor inaccuracies in the other dowel holes.