3.5MM Cobalt Metric Dril Bits. Cobalt Metric Drill Bits are designed for drilling stainless steel, titanium and other high tensile strength materials. Cobalt Metric Drill Bits have a 135 degree split point. Cobalt Metric Drill Bits have a .0374 Decimal Equivalent, 11/16 Flute Length, and 1-5/8 OAL. Call the sales staff at Bisco Tool toll free 1-866-247-2635 for help with all Cobalt Metric Drill Bits.