Twofold by robots relief ground main cutting edges and circumferential cutters. Total length 140 mm. Effective length of the plug max. 70 mm. Precisely ground by diamond wheel on CNC. For the plug production of European and exotic hardwood. Also applicable for some plastics like acrylic glass, Corian, GFRP, HPL coating, polycarbonate, PVC and Trespa board . Long service life. Place 1616 at the edge of the work piece in a way that the outside of the cutter is overlapping the edge, allowing fast chip ejection. TCT (main cutting edges and circumeference cutter) 1500 - 2000 rpm. e.g. Ø 15 mm 1800 rpm in European hard wood