To give you an idea of what a set of TIN-Coated Cobalt Steel bits cost. The set includes 1/16 through 1/2 inch bits, 29 bits in all. $280.00. If these bits are what I think they are you would be wise to test them. I see these type of bits come through our shop and they do not last. It's what you call a marketing move to use gold coloring to cover what is really inside, that being cheap steel. Good luck....
TiN- Coated: (titanium nitride) Bright gold in color. Designed for use on nonferrous and ferrous metals such as free machining steels, nonmetallic materials, and plastics. Drills with this coating require a 25% to 30% increase in machining speeds as compared to uncoated drills. Note: Not for use on wrought aluminum and titanium alloys.
TiCN- Coated: (titanium carbonitride) Violet-gray or gun-metal gray or blue in color. Intended for tough-to-machine steels, ductile cast iron, cast aluminum, stainless steels, high-temperature alloys, copper alloys, and titanium. Drills with this coating require a 35% to 50% increase in machining speeds as compared to uncoated drills.
TiALN-Coated: (titanium aluminum nitride) Dark violet/blue-gray in color. Meant for drilling stainless steel, high alloy carbon steel, nickel-based high-temperature alloys, and titanium alloys. It's also highly effective for abrasive materials such as cast iron, and its high heat resistance may permit dry machining. Drills with this coating require a 75% to 100% increase in machining speeds as compared to uncoated drills.
ALTiN-Coated: (aluminum titanium nitride) Allows for substantial increases in production rates - up to twelve times over conventional carbide tools. Use these double margin drills in high-temperature alloys, stainless steel, and cast iron.
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