These bits have a straw/bronze finish that improves their wear resistance. Cobalt drill bits tolerate higher drilling speeds and are harder and more wear-resistant than high-speed steel drill bits. They provide some shock absorption and can be used in handheld power tools. These bits have spiral flutes that evacuate chips as the bits drill into a workpiece.,Taper length drill bits have a longer flute length and can drill deeper holes than jobber-length drill bits of the same size. Sometimes called long-series drill bits or long jobber drills, they are shorter than extended-length bits. The bits shank diameter and flute diameter are the same.