Straight major cutting edges and a special flute profile ensure good chip evacuation. The robust cutter geometry ensures high-performance drilling with good process reliability. A wide range of applications in steel materials thanks to a combination of tough ultra-fine grain carbide and an extremely wear-resistant coating. Up to dia 1.9 with 4 facets- from dia 2 with relieved cone. Note: Flute length LC = L2 + 1.5 x DC. Standard: DIN 6537 K Tolerance nominal dia : h7 Number of cutting edges Z: 2 Tolerance nominal dia : h7 recommended maximum drilling depth L2: 46 mm Overall length L: 123 mm Shank dia Ds: 18 mm Feed f in steel < 900N/mm2: 0.28 mm/rev.