Drill Bits Jobber Length Black & Gold 17/64 "Sold in sets of 12 High speed steel 118 Point drill performs well in a wide variety of drilling applications. Titanium nitride can extend tool life up to 5 times longer in general purpose drilling applications of materials; such as Steel, Stainless steel, Bronze, Brass an certain Gray iron casting. Titanium nitride coating adds lubricity, hardness andenhancing chip flow.