Use: for drilling very long patch dowels. The tenon cutters are manufactured with a slight excess so that the patch dowels fit perfectly. For use with Forstner drill and art drill. Design: DIN 7489, multi-edged, with peripheral cutting edge and cylindrical shaft. We also manufacture special lengths for drill samples. Up to drm. 32 mm: shaft 13 x 50 mm. From drm. 33 mm: shaft 16 x 50 mm.