Drill America D/A20J CO Set 20 Piece Cobalt Steel Jobber Length Bit in Metal Case, Gold Oxide Finish, Round Shank, Spiral Flute, 135 Degrees Split Point (Pack of 1)

Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools Round shanks allow use with a wide variety of toolholding systems When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging 20 piece drill bit set comes in a metal case