Domino made from Sipo wood, resistant to insect and mold infestation, making it ideal for outdoor use. The cross-section of a Domino dowel corresponds to that of three round dowels of the same drill diameter, which makes it extremely stable in comparison. The lateral guiding ribs center the dowel in the middle of the Domino mortise, ensuring perfect alignment of the workpieces. Specially shaped glue pockets and longitudinal grooves distribute the glue evenly for an optimal bond. Excess glue can escape through the lateral longitudinal grooves. 100% twist-proof from the very first Domino dowel. Quickly find the right dowel thanks to embossed size markings. The unique shape, combined with swelling glue pockets and longitudinal grooves, provides the dowels with a secure hold. For absolutely twist-proof connections and maximum stability. And with significantly faster processing: The first dowel hole is easily aligned and precisely milled with the help of stop flaps. It immediately fixes the workpieces to be joined exactly and flush to the edge. The Domino system also tolerates minor inaccuracies in the subsequent dowel holes.