Pro Steel Solid Carbide Drill, 1/8 inch Dia, 140 Deg Point Angle, TiAlN Coated, Plain Shank Standard: DIN 6537 Tolerance nominal dia : h7 Number of cutting edges Z: 2 Tolerance nominal dia : h7 recommended maximum drilling depth L2: 23.Note: Flute length LC = L2 + 1. Straight major cutting edges and a special flute profile ensure a good chip evacuation.