Drilling aid for all common comforter connections with 6mm, 8mm and 10mm diameters for corner, angle, T and surface connections. Dowel gauge made of hard plastic for producing precisely fitting joints such as in glued laminated timber, solid wood and chipboard. The dowel aid is particularly suitable for vertical 90-degree holes in various materials such as hardwood and tiles. Thanks to the rubber anti-slip protection for smooth surfaces, safe and precise work is also guaranteed here. Optimally applicable as set with the LINE MASTER precision ruler and the guide for the dowel professional. With the adjustable turntable of the dowel drilling jig, drill holes with a diameter of 3 mm to 12 mm can be drilled.