Drill America #18 Cobalt Stubby Threaded Shank Drill Bit Overall Length 5/8, TSD Series #18 1/4"-28 Inches 0.625 Inches 135 Degrees Black Oxide Cobalt TSD 1 TSD18ST

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,Threaded shank is for use with threaded-spindle tools, often used in aerospace and automotive applications,When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging,Featured with 135 degrees heavy duty split point and surface treated for drilling hard, tough, high tensile strength materials