25 Piece Cobalt Metric Drill Bit Set. 1mm to 13mm by .5 increments. 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. Call the sales staff at Bisco Tool toll free 1-866-247-2635 for help with all Cobalt Metric Drill Bits.